Question

The equivalent weight of calcium phosphate Ca₃(PO₄)₂ is (Mol. wt. = 310) 

(a) 310/2

(b) 310/6

(c) 310/3

(d) 310

Answer 1

Correct option is (b) 310/6

2Ca₃​(PO_4​)₂​ → 6Ca⁺² + 4(PO₄​)³⁻

Ca₃​(PO₄​)²​

O.S & Ca → +2

MM of Ca₃​(PO₄​)₂​ → 310 gm

Equation mass = \(\frac{\text{Mw of salt}}{\text{charge}}\)

Phosphic = \(\frac{2 \times 310}{6 \times 2}\)

= \(\frac{ 310}{6}\)