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How many grams of phosphoric acid would ...

How many grams of phosphoric acid would be needed to neutralise `100 g` of magnesium hydroxide? (The molecular weight are: `H_(3)PO_(4) = 98` and `Mg(OH)_(2) = 58.3)`

A

`66.7 g`

B

`252 g`

C

`112 g`

D

`168 g`

Text Solution

Verified by Experts

The correct Answer is:
C
`3 Mg (OH)_(2) + 2H_(3) PO_(4) rarr Mg(PO_(4))_(2) + 3H_(2) O`
`(3 xx 58.3)/(2 xx 98) = (100)/(W), :. W = 112 g`
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