<p><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>H</mi><mn>3</mn></msub><mi>P</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is a tribasic acid and one of its salts in&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><mi>a</mi><msub><mi>H</mi><mn>2</mn></msub><mi>P</mi><msub><mi>O</mi><mn>4</mn></msub></math>. What volume of 1 M NaOH should be added to 12 g&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><mi>a</mi><msub><mi>H</mi><mn>2</mn></msub><mi>P</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;(Molar mass 120) to exactly convert it into&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><msub><mi>a</mi><mn>3</mn></msub><mi>P</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;?</p>