1. Acetic Acid pK. = 4.76, Ke= 2 Complete the following table using data from yo

Question

1. Acetic Acid pK. = 4.76, Ke= 2 Complete the following table using data from your laboratory notebook M Con aud conj bas Solution HC,H,02 C,H,OC,H,O2PH pH pH difference _ | before HCI | after HCI added pHbefore pHar 2.86 1.6 0 161883 2.86 2 833 Soof.soo , 14.76 14:41 904/.0409 .506 o.63 5 7.48 540 2.08 3. Determine which solutions (list number) would be expected to have any buffer capacity. Show how these solutions meet this criteria. Does your data after the addition of acid indicate buffer capacity for these solutions?

Explanation / Answer

Q1 Given: pKa of acetic acid=4.76

pKa is the negative base-10 logarithm of acid dissociation constant (Ka ) of solution

pKa= -log10Ka

4.76=-log10Ka

-4.76=log10Ka

Ka =(10)-4.76

for acetic acid, Ka=1.375×10-5 M

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