What is the ph of a solution which is 0.021 m in weak base, Ask an Expert

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A buffer solution is made using a weak acid, HA, that has a pKa of 6. If the pH of the buffer is 9, what is the ratio of Aâ€" to HA?
A-/HA=?

What is the pH of a solution which is 0.021 M in weak base and 0.039 M in the conjugate weak acid (Ka = 7.1 Ã- 10â€"6)?
pH=?

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