Question

If the $N{a}_{2}Oand{K}_{2}O$ content in a given cement is 1.0% and 0.5%, the total alkali content in the cement in terms of Equivalent $N{a}_{2}O$ can be taken as ______.

• A. 1.5 %
• B. 1.1 %
• C. 1.3 %
• D. 1.0 %

Answer 1

The correct option is C 1.3 %

Given,
$N{a}_{2}Oand{K}_{2}O$ content 1 % and 0.5%
Total alkali content in terms of equivalent $N{a}_{2}O$
$=1\times \frac{equivalentwt.ofN{a}_{2}O}{equivalentwtofN{a}_{2}O}+\frac{0.5\times eq.wt.ofN{a}_{2}O}{eq.wt.of{K}_{2}O}$

$=1\times \frac{61}{61}+0.5\times \frac{61}{94}=1.3$