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Please answer parts A-D for full upvote. Thank you in advance. A buffer contains 0.010mol of lactic acid (pKa=3.86) and 0.050mol of sodium lactate per

Please answer parts A-D for full upvote. Thank you in advance.
A buffer contains 0.010mol of lactic acid (pKa=3.86) and 0.050mol of sodium lactate per liter. (a) Calculate the pH of the buffer. (b) Calculate the change in pH when 5mL of 0.5M HCl is added to 1L of the buffer. (c) Calculate the change in pH when 5mL of 0.5M NaOH is added to 1L of the buffer. (d) What pH change would you expect if you separately added the same quantity of HCl and NaOH to 1L of pure water

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