Published by:
CGP EDU Academic Team
Published on: August 14, 2026
An enviromental chemist needs a carbonate buffer of pH 10 to study the effects of the acidification of limestone–rich soils. How many grams of Na 2 CO 3 must be added to 1.5 L of freshly prepared 0.2 M NaHCO 3 to make the buffer ? For H 2 CO 3 , 
= 4.7 × 10 –7 ; 
= 4.7 × 10 –11 .
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(15 g Na 2 CO 3)
pK a = 11 – log 4.7
pH = pK a + log 
∴ 10 = 11 – log 4.7 + log 
log 
= 1 ⇒ 
= 0.141
= 0.141 × 106 = 14.946 ≈ 15 gram
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