A buffer solution is made by adding 0.40 𝑚𝑜𝑙𝑒 of formic acid 𝐻𝐶𝐻

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A buffer solution is made by adding 0.40 𝑚𝑜𝑙𝑒 of formic acid
𝐻𝐶𝐻𝑂2 , 𝐾𝑎 = 1.7 × 10−4 and 0.20 𝑚𝑜𝑙𝑒 of sodium hydroxide to 1.0 𝐿
of water. a) Find the 𝑝𝐻 of the buffer. b) What is the 𝑝𝐻 after
0.020 𝑚𝑜𝑙𝑒 of 𝐻𝐶𝑙 is added to the buffer in a)? c) What is the 𝑝𝐻
after 0.020 𝑚𝑜𝑙𝑒 of 𝑁𝑎𝑂𝐻 is added to the original buffer in a)? d)
What is the 𝑝𝐻 after 0.20 𝑚𝑜𝑙𝑒 of 𝐻𝐶𝑙 is added to the original
buffer? Assume no change in volume in b), c) and d) 2