1. Experiment 6 Standard Acid Calculations
Heather Mayes

2. Making 1L of 0.1 M HCl
Calculate molarity of 37 wt% (concentrated) HCl (density 1.19 g/mL)
then use M1V1=M2V2

3. Choosing Appropriate Mass of Primary Standard
Calculate moles HCl in 25 mL of 0.1 M HCl solution
Determine mass of primary standard to react with the equivalent number of moles
(Vol. Std. Soln.)(M Std. Soln.)(Molar Ratio Primary Std:Std)* (MW Primary Std) = Mass Primary Std.
2HCl + Na2CO3  2NaCl + H2O + CO2 (g)

4. Determine Actual Molarity of HCl Solution

5. Report Average, Standard Deviation, Relative Std. Dev.
0.100 ± M HCl

6. Question
If you want to standardize 0.42M HCl, how much Na2CO3 should you use?