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The addition of NaH (2) PO (4) to 0.1 MH...

The addition of `NaH _(2) PO _(4)` to `0.1 MH _(3) PO_(4)` will cause

A

No change in pH value

B

Increase in its pH value

C

Decrease in its pH value

D

Change in pH cannot be predicted

Text Solution

Verified by Experts

The correct Answer is:
B
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Find the equivalent weight of H_(3) PO_(4) in each of the following reactions: H_(3) PO_(4) + OH^(-) to H_(2) PO_(4)^(-) + H_(2) O H_(3) PO_(4) + 2OH^(-) to HPO_(4)^(2-) + 2H_(2) O H_(3) PO_(4) + 3OH^(-) to PO_(4)^(3-) + 3H_(2) O

To 100 ml CaCl_(2) solution containing 6.66g CaCl_(2) , 100 ml of 0.5M Na_(3)PO_(4) solution is added. The mass of Ca_(3)(PO_(4))_(2) precipitated would be ?

In the equilibrium H_3 PO_4+H_2 O hArr H_2 PO_4^(-) + H_3 O^+ the equilibrium constant is most likely to be changed by: adding H_2 PO_4^- ion, adding H_3 PO_4 , adding a catalyst, heating the mixture

In the disproportionation reaction H_(3)PO_(2)toH_(3)PO_(3)+PH_(3) (atomic mass of P=31) Equivalent weight of H_(3)PO_(2) 1. As an oxidising agent is 16.5 2. As a reducing agent is 33 3. Net equivalent weight of H_(3)PO_(2) is 49.5 4. As an acid is 66

Structure of phosphoric acid is : (pK_(a1) = 2.12, pK_(2) = 7.21 , pK_(a3) = 12.32) First ionization of phosphoric acid is : H_(3)PO_(4) hArr H_(3)PO_(4)^(-) + H^(+), pK_(a1) = 2.21 . The dissociation constant of conjugate base of H_(2)PO_(4)^(-) will be :

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