Homework Answers
HCl dissociates as:
HCl(aq) + H2O(l) —> H3O+(aq) + Cl-(aq)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution
Given:
M1 = 0.5 M
V1 = 3 mL
V2 = 100 mL
use:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (0.5*3)/100
M2 = 0.015 M
[H3O+] = 0.015 M
use:
pH = -log [H3O+]
= -log (1.5*10^-2)
= 1.8239
Answer: 1.82
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