Question

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01 USC
4. The normality of orthophosphoric acid having purity of 70% by mass and specific gravity
11.54 g/mL is :
(a) 11 N
(b) 15 N (c) 33 N
(d) 30 N​

Answer 1

Answer:

Explanation:

Mass =70 %*1.54 =1.078 g/ml

Mass in 1000 ml solution=1.078*1000=1078 g

Molar mass of orthophosphoric acid=98 g

Normality of orthophosphoric acid=(Mass of solute in 1L)/(Molar mass/basicity)

                                                    =(1.078)/(98/3)

                                                    =33 N

So,the normality of orthophosphoric acid having purity of 70 % by weight and specific gravity 1.54 is 33N.