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20.0 mL of 4.00 M HF and 40.0 mL of 2 M HCL are mixed. What...

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Chemistry

20.0 mL of 4.00 M HF and 40.0 mL of 2 M HCL are mixed.

What is the PH of the solution if the Ka of HF is 6.8 x10^-4

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