To make future dilutions easier, Kai wants to prepare a stock solution at the correct concentration such that he can take 25.0 mL of the stock solution to prepare 755 mL of his 0.75 M (NH4)2SO4 solution. What concentration should he make the stock solution? (The molar mass of (NH4)2SO4 is 132.14 g/mol).
A 40.0 mL aliquot of a city drinking water was treated with a small amount of an NH3-NH4Cl
buffer to bring the pH to 10. After the addition of Calmagite indicator, the solution required
10.46 mL of 5.140 x 10^-3 M EDTA. Calculate the water hardness in terms of ppm CaCO3.
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