campuran 50 ml asam format(HCOOH) 0,2 n (Ka=1x10-4) dengan 40 ml larutan NaOH 0,2 mempunyain ph ? a.4 b.5-log2,5 c.5 d.5+log2,5 e.6 tolong dibantu beserta caran

HCOOH + NaOH → HCOONa
m : 10M ... 8M → —
r : 8M .... 8M → 8M
____________________-
s : 2M .... — → 8M

H^+ = Ka . Asam lemah/bs konj
= 10^-⁴ × 2/8
= 2,5 × 10^-5

PH = - log 2,5×log 10^-5
= 5-log 2,5

m mula²
r reaksi
s sisa