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Coordination and Oxidation Number

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Determine the molar concentration of H+ and OH- ion in a mixture of equal volumes of milar H3PO4 and semimolar Ca(OH)2

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Q. A mixture of

100 m m o l

C a (O H)_{2}

2 g

of sodium sulphate was dissolved in water and the volume was made up to

100 m L

. The mass of calcium sulphate formed and the concentration of

O H^{-}

in resulting solution, respectively, are:

C a (O H)_{2}, N a_{2} S O_{4}

C a S O_{4}

74, 143

136 g m o l^{- 1}

, respectively;

K_{s p}

C a (O H)_{2}

5.5 \times 10^{- 6}]

Q. Equal volumes of three acid solutions of

p H 3, 4

5

are mixed in a vessel. What will be the

H^{+}

ion concentration in the mixture?

V_{1} m l

of x molar hydochloric acid is mixed with

V_{2} m l

of y molar sodium hydroxide. Arrange the following steps in correct sequence for calculation of pH of the mixture. (y > x and

V_{1} > V_{2})

(a) Calculation of the number of equivalent of acid and base.
(b) Calculation of the total volume of mixture.
(c) Calculation of the normality of acid and base.
(d) Calculation of the net

O H^{-}

ion concentration.
(e) Taking the negative logarithm of

H^{+}

ion concentration.
(f) Dividing

K_{w}

O H^{-}

ion concentration.

Equal volumes of 0.1M AgNO₃and 0.2M NaCl are mixed. The concentration of NO^-₃ ions in the mixture will be

Q. Equal volumes of three acid solutions of

p H 3, 4, a n d 5

are mixed in a vessel. What will be the

H^{+}

ion concentration of the mixture ?

a n t i l o g_{b} (- x) = b^{- x}

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