<p>0.7g of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><mi>C</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>.</mo><mo>&#160;</mo><mi>x</mi><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;were dissolved in water and the volume was made to 100 mL, 20 mL of this solution required 19.8 mL of N/10 HCl for complete neutralisation. The value of x is</p>