Open Question
To what volume should you dilute 125 mL of an 8.00 M CuCl2 solution so that 50.0 mL of the diluted solution contains 4.67 g of CuCl2?
Ch.13 - Solutions
Chapter 13, Problem 57
A hard water sample contains 0.0085% Ca by mass (in the form of Ca2+ ions). How much water (in grams) contains 1.2 g of Ca? (1.2 g of Ca is the recommended daily allowance of calcium for adults between 19 and 24 years old.)
Verified step by step guidance1
Identify the percentage of calcium in the water sample, which is given as 0.0085% by mass.
Understand that this means there are 0.0085 grams of calcium in every 100 grams of water.
Set up a proportion to find out how many grams of water contain 1.2 grams of calcium. Use the relationship: (0.0085 g Ca / 100 g water) = (1.2 g Ca / x g water).
Solve the proportion for x, which represents the mass of water that contains 1.2 grams of calcium.
Rearrange the equation to solve for x: x = (1.2 g Ca * 100 g water) / 0.0085 g Ca.
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Open Question
You can purchase nitric acid in a concentrated form that is 70.3% HNO3 by mass and has a density of 1.41 g>mL. Describe exactly how you would prepare 1.15 L of 0.100 M HNO3 from the concentrated solution.
Open Question
Describe how to prepare each solution from the dry solute and the solvent. a. 1.00×102 mL of 0.500 M KCl b. 1.00×102 g of 0.500 m KCl c. 1.00×102 g of 5.0% KCl solution by mass