All Questions
Tagged with notation concentration
9 questions
-1
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1
answer
190
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Convention for writing concentration units
1st part of my question:
Q) The concentration of an NaCl solution is 1M. Express this in percent wt. by vol. unit.
Ans:
$$\text{In %(w/v) unit}=\frac{58.5\pu g}{1000\pu{mL}}\times \frac{100}{100}=5.85\...
- 201
4
votes
1
answer
486
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An exception to the IUPAC convention for italicisation (typography)
According to IUPAC, only physical quantities and variables must be italicised.
Section 8 Use of Italic and Roman Fonts for Symbols in Scientific Text of ICTNS Guidelines for Drafting IUPAC Technical ...
- 1,098
0
votes
1
answer
6k
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Meaning of mass concentration "units" % m/v [closed]
In a saline solution that is 5.750% (m/v) potassium iodide $(\ce{KI}),$ there are:
a) 5.750 mL $\ce{KI}$ per 100.0 mL $\ce{H2O}$
b) 575.0 mg $\ce{KI}$ per 10.00 mL of $\ce{KI}$ solution
c) 5.750 g $\...
- 11
0
votes
1
answer
373
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How to distinguish mass concentration and density?
I am writing a proof where I have to mention both with density and of a material and mass concentration (mass/volume) of a material.
I am using the letter $\rho$ to represent density, and I didn't ...
- 129
17
votes
1
answer
8k
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How to interpret parts-per notations? Is 1 ppb equal to 1 μg/kg?
In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I ...
- 281
0
votes
3
answers
4k
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Conversion from a PPB value to µg/m3 of Isobutylene
I have a quite simple problem, found a lot of information about it, but I am not sure anymore if I do my calculations right.
I own a sensor, which reports measurements in isobutylene units as PPB. So ...
- 111
3
votes
1
answer
652
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What does x mean in (1-x)A – xB composite materials, molar ratio, weight ratio or volume fraction?
I've been collecting data about ceramic materials and often I get to see composite materials are described as $(1-x)\ce{A} - x\ce{B}$. I am confused what this $x$ means. And I haven't seen any of the ...
- 257
12
votes
1
answer
5k
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What do curly brackets {} mean?
I learned that square brackets ex: $[\ce{H2O}]$ can be used to denote the concentration of water molecules in a fluid. The notation used much in equilibrium problems and such.
However, sometimes I ...
- 223
-2
votes
1
answer
24k
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What does the unit M stand for? [closed]
What does $\mathrm{M}$ signify in this pH calculation? To me, it just seems to be a random variable.
For example: $\ce{[H+]} = 1.0\times10^{-7}~\mathrm{M}$
I am not sure what the $\mathrm{M}$ is ...
- 435