1 Acetic Acid pK 476 Ke 2 Complete the following table usin

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?

Solution

Q1 Given: pK_a of acetic acid=4.76

pK_a is the negative base-10 logarithm of acid dissociation constant (K_a ) of solution

pK_a= -log₁₀Ka

4.76=-log₁₀K_a

-4.76=log₁₀Ka

K_a =(10)^-4.76

for acetic acid, K_a=1.375×10^-5 M