Question: could you show step by step how the answer is 1.4 grams? Calculation related to buffer solution How much of NaOH in gram is needed

could you show step by step how the answer is 1.4 grams?

Calculation related to buffer solution How much of NaOH in gram is needed to add to a solution of acetic acid solution 200mL of 0.5M to make it pH=4.5 ? (For acetic acid Ka=4.76 )

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