Questions tagged [titration]

A laboratory method to determine the concentration of an analyte in solution. The solution volume plays a key role in the analysis.

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pH of a solution [closed]

I was attempting to find the pH of a saturated solution of copper (II) iodate. From my understanding, I have to use Ksp to find the concentration of iodate then perform hydrolysis so iodate is acting ...
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Finding the pH at first equivalence point when titrating a diprotic weak acid with a strong base [duplicate]

While titrating a weak acid with a strong base, how do we find the $\mathrm{pH}$ of solution at first equivalence point? Consider following question: $$\ce{InH <=> H+ + In-} \qquad K_\mathrm{in}...
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Could the pH in the equivalence point of strong acid and strong base titration be greater than 7? [duplicate]

I have HCl and NaOH titration and in the equivalence point I get pH=8.6, but the pH must be 7 in this kind of titration, then why this happen? Does it possible that I don't take enough points in the ...
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How to determine the equivalents of OH- in a titration curve

How does one go about determining the equivalents of $\ce{OH-}$ needed for the titration of a weak acid. For example here is the titration curve for Aspartate: Why is the equivalents for $\mathrm{p}...
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Is titration and neutralisation the same thing? [closed]

Is neutralization and titration the same thing for weak acid and strong base? I have seen examples of a titration where the moles of acid and base are the same, and the acid is neutralized. But then I ...
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How can I find molar mass from an unknown acid during titration? [closed]

A student weighed 3.75g of an unknown solid monoprotic acid into a conical flask, added about 50mL of water and then titrated the resulting mixture with a standard 0.25mol/L NaOH solution. If 52.5mL ...
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Does The Concentration of a Produced Salt Affect the Ka value of an acid? [closed]

Does The Concentration of a Produced Salt Affect the Ka value of specifically, Acetic Acid? Why?
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Determine HCl concentration by titrating against NaOH or NaHCO3 [closed]

I have had a bottle of HCl (really just hardware store muriatic acid) that is well past its likely "best if used by" date. The label says 28% (I'll assume by weight), which is about 7.7M. I ...
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Which method has the highest yield of calcium sulfate?

I'm not sure which of following two methods will give better yields for $\ce{CaSO4}$: A. Add dilute $\ce{HNO3}$ to $\ce{CaCO3}$, followed by dilute $\ce{H2SO4}$; or B. Titrate aqeuous calcium ...
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Unlocking concepts in titration [closed]

I was trying to unlock some concepts about titration when I came across three specific questions. These questions mostly came from a titration experiment with the anolyte being vinegar and the titrant ...
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Titration of H+ by iodometry

Propose a titration protocol for a hydrochloric acid solution of approximate concentration 0.1M using the solutions and materials available. Solutions: -$V_0$ = 20mL of hydrochloric acid solution of ...
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Acid titration of sodium acetate in the presence of sodium ethoxide, is it possible?

I have an aqueous solution of ethanol of $30 - 40\text{ V%}$ that contains a few (unknown) $\text{%}$ ethyl acetate (ethyl ethanoate - $\ce{EtOAc}$). I wonder if I can quantitatively determine the $\...
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Concentration of weak acid neutralized by strong base [closed]

I've got a question that should be simple enough but I must be doing something very wrong. A $\pu{10mL}$ sample of $\ce{H2SO3}$ is neutralized by $\pu{18.6mL}$ of a $\pu{0.10M}$ strong base. Find the ...
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168 views

Procedure for measuring EC

Most of the procedures on the internet are of a university research lab level. Is there a simpler method I could use to determine the concentration of EGCG
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My EDTA titration isn't giving the right titre

I am, as a fun off-syllabus investigation, looking at hard water and how effective the EDTA titration method is, for permanent and temporary hard water. I ran a titration today and had horrific ...
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Titration of weak acid and strong base at low concentrations [duplicate]

Titration continues until one of the reactants (the one in conical flask) turns out to be a limiting agent as far as I know. From the titration of a weak acid and a strong base, I could learn that the ...
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Preparation of phosphate buffer of ph 7.4

Can I make a phosphate buffer of pH 7.4 starting with phosphoric acid and then adding NaOH until the pH reaches 7.4. What are the disadvantages of using this method over sodium phosphates?
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Temperature at which the reaction Oxalic acid + KMnO4 becomes autocatalytic

As described many times, the reaction between oxalic acid and potassium permanganate can be autocatalytic due to the production of Manganese ions. I've read that this only occurs at higher ...
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titrating a weak acid with strong base in the present of buffer

I would like to get a neutral salt solution for a weak acid whose pKa is 3.42. This weak acid is in the form of solution (now is 20% w/w), thus I cannot directly dissolve the powder into the buffer ...
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Will potassium permanganate react with ferric chloride?

I came across a question : Which of the following compound does not decolourise an acidified solution of $\ce{KMnO4}$? Answer was: After doing a bit of research I found that $\ce{KMnO4}$ oxidises $\...
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Why can indicator pKa be less than the pH at equivalence?

An indicator usually has a pH at equivalence tolerance range around its pKa value that is suitable for titration. However, if the pH at equivalence exceeds the indicator's pKa, wouldn't most of the ...
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Equivalence point pH derivation of a tribasic acid

Considering $\pu{100 mL} \ \pu{0.1 M} \ \ce{H3A}$ and $\pu{0.1 M} \ \ce{NaOH}$ titration curve: I understood the half equivalence points, but couldn't understand the reason why $\mathrm{pH} = \frac{1}...
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Calculating the pH of a 'buffer' solution?

Question: Determine the $\mathrm{pH}$ of the solution resulting when $\pu{100 cm^3}$ of $\pu{0.50 mol dm-3}$ $\ce{CH2ClCOOH}$ is mixed with $\pu{200 cm^3}$ of $\pu{0.10 mol dm-3}$ $\ce{NaOH}$. The ...
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How to (numerically) model a phosphoric acid titration curve

I've been learning how to simulate a 1M phosphoric acid titration curve using numerical methods in R. So far has this has been the best curve: Notice how it flattens out (artificially) towards the ...
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Determining iron content by titration

The redox reaction is $$\ce{KMnO4-(aq) + 8 H+(aq) + 5 e- -> Mn^2+(aq) + 4 H2O(l)}.$$ Where does $\ce{H+}$ come from in this reaction? What happened to $\ce{K+}$ in potassium permanganate?
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Titration curve equation/function

How can I create a graph of a titration curve (acid-base, strong or weak, not something specific), with an equation or a function. In other words, what is the equation that describes such a curve that ...
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EDTA titrations of singly charged cations

It is well known that EDTA can be used for titrations involving complexations of highly charged metal cations, with the most well known being those of the alkali earth metals and transition metals. ...
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How is the selective titration testing equation simplified?

When there is $\ce{N^m+}$ and $\ce{M^n+}$ metal ions in a solution with respective m and n charge, $\ce{N^{m+}, M^{n+}}$ reacts with EDTA($\ce{Y}$) as follows: $$\ce{N^m+ + Y^4- <=> NY^{m-4}}$$...
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Writing a chemical equation with a reactant of unspecified chain length [closed]

Would appreciate it if I got some general tips and hints and not the solution cause I'm trying to learn from this question :) The question is as follows: FA1 is a solution containing $\pu{5.00 g dm-3}...
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what is the concentration of EDTA after titration with Zinc Metal?

I take $\pu{1g}$ of zinc metal and after dissolving, diluting it to $\pu{500 ml}$ and adjust the $\mathrm{pH}$ of $\pu{50 ml}$ of it to make titration with an unknown concentration of EDTA. I found $\...
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Can I measure the molarity of Acetic Acid titrating Vineger with Sodium Hydroxide?

Imagine I have 5 g of vineger which I titrated with 33 mL of 0.1M Sodium Hydroxide (NaOH). I tried V₁S₁=V₂S₂ formula but It needs the volume of the acid. I have tried to calculate the volume with W=...
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Combining solutions with multiple concentrations - Mixing NPK fertilizer ratios

I'm trying to mix my own fertilizer to grow some peppers. Fertilizers are labeled with NPK ratios, so mixing two volumes and finding the result is easy: Just multiply the concentration of each ...
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Is this stoichiometric question answerable? (unknown variable)

This question kind of borders on the fields of both semantics and math, as well as chemistry, but I still believe this is the right place to ask. On a test I took, a question was posed as such: Via ...
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Sodium Deoxycholate titration assay

Purchasing chemicals online often I see "Sodium Deoxycholate, ≥97% (titration)" offers. Is there any publicly available titration protocol I can use to confirm that statement in my very ...
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What concentration is phenolphthalein indicator ? 1% or 0.1%

I read some information about phenolphthalein indicator, some websites suggested phenolphthalein indicator of 1%, others mentioned phenolphthalein indicator of 0.1%. What is the difference of both of ...
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Understanding strong acid titrated with weak base graph

I don’t understand why the conductivity doesn’t change after the equivalence point. To my understanding, at the equivalence point there is $\ce{NH3}$, $\ce{NH4+}$ and $\ce{Cl-}$ in the solution. As ...
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pKa = pH for strong acid — strong base?

I have learnt that for a weak acid — strong base titration, $\mathrm{p}K_\mathrm{a} = \mathrm{pH}$ at the half equivalence point. However, the same conclusion is not drawn when discussing strong acid —...
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Why is the gradient of the curve of a strong base titrated with strong acid small up until equivalence?

I understand the cause of the sharp decrease in pH upon reaching the equivalence point, but I don't understand why addition of relatively large amounts of the strong acid would be accompanied with ...
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Best pH indicator for titration

Which substance is best suited as a pH indicator for titration of $\pu{15 mL}$ of $\pu{0.1 M}$ ascorbic acid $(K_\mathrm{a} = \pu{7.9E-5})$ with $\pu{1.0 M}$ sodium hydroxide solution? Using the image ...
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Equivalence point of titration of Sodium carbonate

The pH at the equivalence point of titration of $\ce{Na2CO3}$ solution with $\ce{HCl}$ is around 3.7, as shown in this titration curve: At this point, the following reaction is completed: $$\ce{...
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Will washing a conical flask with deionised water to remove splashes affect the titration result?

When performing a titration, once the acid/base in the burette is slowly released into the conical flask, it may splash onto the sides of the conical flask. It is then advised that we wash the sides ...
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When titrating to find the concentration of a dissolved acid, does the volume of solvent matter?

I am conducting a titration to find the mass of aspirin present in tablets. I will be dissolving the aspirin tablet into a solution of ethanol and distilled water to dissolve it. But, does the volume ...
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How can I mask the Chromium (III) and Chromium (VI) ions in my solution?

I want to conduct a quantitative analysis on my acid etching solution for my Aluminum pre-treatment process. The easiest way for me to conduct my quantitative analysis of Al is through complexometric ...
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Weak acid titration curve [duplicate]

At the beginning of a weak acid titration curve (when titrated with a strong base), there is a sharp increase of pH before it levels out more due to the buffer solution that will occur. But why is ...
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Difference in titration curves

In my titration curve for HCl being titrated with NaOH, the initial pH-value was plotted as 2.1 according to a pH-meter. When I found the equivalence point and calculated the concentration of HCl, it ...
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Acidic KMnO4 oxidizes H2S to S. Why doesn't the oxidation proceed further to sulfur oxide, sulfur dioxide or sulfur trioxide?

I have some idea about the question. I think it has to do with oxidation/reduction potentials but I am not able to find any resource for the exact values or how to make sense of them in this context. ...
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How is indigo carmine used in Lowenthal-Permanganate titration as a redox indicator?

In a Lowenthal-Permanganate titration, cider tannins are quantified by titrating the cider with indigo carmine indicator and sulfuric acid against potassium permanganate. Tannins are antioxidants, so ...
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Unusual Titration Curve Explanation

From Costanzo's Physiology book in Acid-Base Physiology chapter, this titration curve of a weak acid ($\ce{HA}$), in the context of discussing buffers is provided: What confused me is that in this ...
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Titration calculations - working out cation [closed]

so I was doing this question and I have some questions about what I did. Firstly am I correct to say that the concordant results = 24.1 cm^3 because there are 2 of these values. From this I then ...
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Does cellulase catalyze the hydrolysis (or break down) of soluble starch?

I’m attempting to perform an Iodometric redox titration to evaluate the vitamin c concentration in a particular solution. These solution have dissolved within them up to 2% cellulase enzyme. In an ...

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