1.5 g sample of P_(2)O_(3) and some impurity was dissolved in water and warmed gentally till P_(2)O_(3) disproportionated quantitatively to PH_(3) and H_(3)PO_(4). The solutionswas then boiled to get rid off PH_(3(g)) and then cooled finally to room temperature and diluted to 100 mL. 10 mL of this solution was mixed with 20 mL of 0.3M NaOH. Now 10 mL of this solution required 3.6 mL of 0.05 M H_(2)SO_(4) for back titration. Determine % by weight of P_(2)O_(3) in sample.

1.5 g sample of P_(2)O_(3) and some impurity was dissolved in water an

1.	1.5 g sample of P_(2)O_(3) and some impurity was dissolved in water and warmed gentally till P_(2)O_(3) disproportionated quantitatively to PH_(3) and H_(3)PO_(4). The solutionswas then boiled to get rid off PH_(3(g)) and then cooled finally to room temperature and diluted to 100 mL. 10 mL of this solution was mixed with 20 mL of 0.3M NaOH. Now 10 mL of this solution required 3.6 mL of 0.05 M H_(2)SO_(4) for back titration. Determine % by weight of P_(2)O_(3) in sample.
Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :`<a href="https://interviewquestions.tuteehub.com/tag/80-337972" style="font-weight:bold;" target="_blank" title="Click to know more about 80">80</a>%`;</body></html>