Homework Answers
9)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution
Given:
M1 = 9 M
M2 = 2.75 M
V2 = 350 mL
use:
M1*V1 = M2*V2
V1 = (M2 * V2) / M1
V1 = (2.75*350)/9
V1 = 107 mL
Answer: 107 mL
10)
Balanced chemical equation is:
H2SO4- + 2 KOH ---> K2SO4 + 2 H2O
Here:
M(H2SO4-)=0.737 M
M(KOH)=0.827 M
V(H2SO4-)=35.0 mL
According to balanced reaction:
2*number of mol of H2SO4- =1*number of mol of KOH
2*M(H2SO4-)*V(H2SO4-) =1*M(KOH)*V(KOH)
2*0.737 M *35.0 mL = 1*0.827M *V(KOH)
V(KOH) = 62.4 mL
Answer: 62.4 mL
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