Q.
100 ml of 0.2 M H2SO4 is added to 100 ml of 0.2 M NaOH. The resulting solution will be
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a
Acidic
b
Basic
c
Neutral
d
Slightly basic
answer is A.
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Detailed Solution
Meq of 0.2 M H2SO4 = 2 × 0.2 M1000 × 100 = 0.04 meq/LMeq of .2 M NaOH = 0.2 1000 × 100 = 0.02 meq./L H+ left unreacted = 0.04 -0.02=0.02Total volume = 200 ; [H+] = 0.02200 = .0001=10-4MpH =-log [H+] = 4.Another method: Strength of H2SO4 =VANA=100×0.4 =40 (Since NA=2×M) Strength of NaOH =VBNB =100×0.2=20 ∴ VANA > VBNB and the resultant solution is acidic.
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