Practice Problems for Quant
1. Calculate the grams of solute required to prepare 250 mL of the following solutions
a. 0.100 M K4Fe(CN)6
b. 2.00 ppm Na+ from NaCl
c. 2.05 ppb Na+ from Na2SO4
2. An acid is 0.620 M. How would you make 1.000 L of a 0.500 M solution of this acid?
3. Calculate the answer with absolute uncertainty for the following calculations
a. 7.07±0.03 + 6.5±0.4 =
b. (456.57±0.06)/(915.472±0.004) =
c. [(81.32±0.09 * 0.1399±0.0002)/(-3.12±0.01)] - 22.3323±0.0001
4. Six replicates of determination of zinc in an individual’s hair gave the following results in ppm
2.67, 2.75, 2.82, 3.01, 2.94, 2.87
What is the mean and standard deviation of the results?