What concentration of HF (Ka = 7.2 × 10-4) has the same pH as that of 0.070 M HCl?
A) 6.8 M
B) 5.0× 10-6 M
C) 1.0 × 10-2 M
D) 0.070 M
E) 0.15 M
Correct Answer:
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