B. 0.050 N;
C. 0.25 N;
D. 0.50 N; or
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D. 0.5 N
Molarity= 100*0.21/84=0.25 M
Normality for Na2CO3 is twice its molarity .
This is not the answer, the answer is 0.25 N... But the question and answer book does not explain why, could you try to answer the question once more?
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