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A buffer is prepared by adding 0.250 mol of NaF to 1.00L of 0.100 M HF....

A buffer is prepared by adding 0.250 mol of NaF to 1.00L of 0.100 M HF. Calculate the pH of the resulting solution. Use Ka value of 7.2× 10^4

How many moles of NaOH must be added to this buffer solution to change the pH by 0.38 units?

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