Stock phosphoric acid solution is 85 % H 3 PO 4 (by mass of solution) and has a specific gravity of 1.70. Hence, molarity of H 3 PO 4 solution is

Question

Stock phosphoric acid solution is 85 % H 3 PO 4 (by mass of solution) and has a specific gravity of 1.70. Hence, molarity of H 3 PO 4 solution is (A) 8.51 M (B) 1.70 M (C) 14.74 M (D) 7.37 M

Tardigrade Admin · Accepted Answer

100 g H 3 PO 4 solution has =85 g H 3 PO 4 (100/1.7) mL H 3 PO 4 solution has =85 g H 3 PO 4 =(85/98) mol ∴ Molarity =(85 / 98 mol /((100)1.7 × 1000 L ))=14.74 M

Q. Stock phosphoric acid solution is $85% H_{3} P O_{4}$ (by mass of solution) and has a specific gravity of $1.70$ . Hence, molarity of $H_{3} P O_{4}$ solution is

$8.51 M$

$1.70 M$

$14.74 M$

$7.37 M$

$100 g H_{3} P O_{4}$ solution has $= 85 g H_{3} P O_{4}$
$\frac{100}{1.7} m L H_{3} P O_{4}$ solution has $= 85 g H_{3} P O_{4}$
$= \frac{85}{98}$ mol
$∴$ Molarity $= \frac{85/98 m o l}{( \frac{100}{1.7 \times 1000} L )} = 14.74 M$

Q. Stock phosphoric acid solution is 85%H3​PO4​ (by mass of solution) and has a specific gravity of 1.70. Hence, molarity of H3​PO4​ solution is

8.51M

1.70M

14.74M

7.37M