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16 views

How can I calculate molar concentration from a precipitate? [on hold]

In a sample of water, $V=\pu{1000 mL}$, I found the concentrations of $\ce{Mg^2+}$ and $\ce{Ca^2+}$ ions that cause the hardness of the water. Then added enough $\ce{Na2CO3}$ to get $\ce{MgCO3}$ and $\...
3
votes
0answers
221 views

The behaviour of Ag3PO4 in solution

To a $\pu{1L}$ flask, we add $\pu{4.1900 g}$ ($\pu{0.01001 mol}$) of $\ce{Ag3PO4}$, then fill it up with water. Knowing the following constants, we are asked to find the concentration of all species ...
0
votes
1answer
39 views

Volume of NaOH needed to precipitate copper(II) but not calcium

I have $\ce{NaOH}: C = \pu{0.1M}, V_{\ce{NaOH}}$ that I want to progressively add in a solution (in water) of: $$\begin{align} \ce{Cu^{2+}}&: \pu{0.01M}; & K_\mathrm{sp} &= 10^{-18.6} \\ \...
4
votes
1answer
266 views

Mathematical explanation of blank titration in Mohr method for argentometry

In my book it is written that in order to minimize systematic error in Mohr method for argentometry it is a common procedure to conduct a blank titration with $ \mathrm{Ag^+} $ against a $\mathrm{CrO_{...
0
votes
1answer
340 views

How to determine the amount of barium in a sample of contaminated water?

Here is the assignment I have: You are working for Matrix Pro - a company involved in analytical assessment and method development for the clean-up of contaminated waters. You received water ...
3
votes
2answers
2k views

Method and Tips for Inorganic Qualitative Analysis

In a few weeks time, I will be doing an inorganic qualitative analysis test which is very pressed for time (a majority of people don't finish). The form of the test is most likely going to be that ...
1
vote
0answers
58 views

Triiodide ion gravimetric analysis Reaction Equation

Last week I did a gravimetric analysis from the following reaction. $\ce{AgNO3 + (CH3)4N+I3- -> AgI(s) + (CH3)4N+NO3- + I2}$ The objective was to identify if my reactant was triiodide or ...
4
votes
1answer
509 views

Gravimetric analysis of barium or sulfate

Which is a better way to obtain barium sulfate precipitate for gravimetric analysis: by adding $\ce{Ba^2+}$ ions to sulfate ion solution, or the other way round? I think it is better to precipitate ...