All Questions
Tagged with aqueous-solution concentration
94
questions
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Can analytical precision be finer than a lower detection limit?
Can analytical precision be finer than a lower detection limit?
For example, if the lower detection limit of an analytical method is reported as 0.010 ppm. Is it possible to have an analytical ...
1
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1
answer
371
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Creating 1L of 1000 ppb stock solution of Pb2+
I’m testing on samples that require a concentration of 1000 ppb (or 1 mg/L) of Pb 2+. My first thought was to simply dissolve 1 mg of Lead nitrate in 1 L of deionized distilled water to create 1 L of ...
3
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1
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183
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Hydrochloric acid substitute in an Iron-gall ink solution
Recently I started experimenting with making my own ink to be used in fountain pens.
I was wondering if hydrochloric acid in an iron-gall ink is used to prevent sediment ONLY by lowering the pH of ...
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2
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How much of Sodium dichloro-s-triazinetrione dihydrate should I use to replace bleach? [closed]
I am trying to determine how much sodium dichloro-s-triazinetrione dihydrate powder I should add to water to create a dilution that can be injected into my water supply to react with the Hydrogen ...
3
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1
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474
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Up to which dilution can one assume that 1 mg/l = 1 ppm?
For aqueous solutions it is often assumed that 1 milligram per liter equals 1 ppm. Are there any guidelines up to which concentration this shortcut is admissible?
Are there any formulas which ...
-1
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1
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108
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What formula allows adjusting balance of (Ethyl Alcohol / Water / Caffeine powder) to know concentration for the Caffeine solution?
I am experimenting with different levels of concentrated caffeine solution. The solution has a small percentage of ethyl alcohol, in the $\ce{H2O}$.
Problems encountered too much ethyl alcohol ...
1
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3
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57k
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Electrochemistry conditions for voltage to increase in a galvanic cell
I understand that increasing the concentration of reactants in a galvanic cell generally causes the voltage of the cell to increase. But is that really the case always?
Consider a standard cell of ...
0
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1
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5k
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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 $\...
-1
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1
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1k
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How to find osmolarity of a solution contatining salt and glucose?
What is the osmolarity of a solution that contains $4.00\%$ (m/v) $\ce{NaCl}$ $(M = \pu{58.44 g mol-1})$ and $3.00\%$ (m/v) glucose $(M = \pu{180.18 g mol-1})?$
I know you have to convert percentages ...
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130
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Viscosity and concentration of solutions
I will need a fluid around a specific viscosity, using a mixture of water and something like sugar.
Is there a way to calculate viscosity based on concentration?
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1
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Molarity of pure water [closed]
The molarity of pure water is 55.5 M at which temprature is obtained this value? Further, you will come across that 1000 mL = 1000 g (for water only, but at which temprature?)
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What is the final molar concentration (molarity) of the nitrate ions in the resulting solution?
A chemist mixes 16.3 mL of 1.23 M sodium nitrate with 6.28 mL 0.823 M solution of calcium nitrate. What is the final molar concentration (molarity) of the nitrate ions in the resulting solution?
What ...
1
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1
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87
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Neutralisation Reaction Confusion
What will happen when $\pu{1 mol}$ of $\ce{H2SO4}$ reacts with $\pu{1 mol}$ of $\ce{NaOH}$?
Will $\pu{1 mol}$ each of $\ce{NaHSO4}$ and water be formed?
Or will $\pu{0.5 mol}$ of $\ce{H2SO4}$ will ...
0
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1
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328
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Adjustment of calcium, magnesium and alkalinity in drinking water?
It's been a long time since I did any molar chemistry in school and despite doing a lot of reading on the subject this week, I am making a mess of some basic calculations. I hope that someone who ...
2
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2
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370
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Molarity Numerical on Mixing Solutions
If 3 L of 1 M NaOH solution is prepared by mixing properties of stock solutions of $x$ L of 2.5 M NaOH and $y$ L of 0.4 M NaOH and no water is to be used, find $x : y$.
My attempt:
$$3 = 2.5x + 0.4y$...