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Preparation and Properties of Potassium Bicarbonate and Sulphate

12. Fe(OH)2 i...

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12. Fe(OH)2 is diacidic base has K10and K2.5x 10What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution?(a) 4x 109(b) 2.5x 10(c) 10-10(d) 10-4

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F e (O H)_{2}

is a diacidic base with

K_{b_{1}} = 10^{- 4}

K_{b_{2}} = 2.5 \times 10^{- 6}

. What is the concentration of

F e (O H)_{2}

0.1 M F e (N O_{3})_{2}

Q. Concentrated strong acid is added to a solid mixture of 0.015 mole samples of

F e (O H)_{2}

C a (O H)_{2}

placed in one litre of water. At what value of pH will the dissolution of each hydroxide be complete? (Assume negligible volume change)

K_{s p} [F e (O H)_{2}] = 7.9 \times 10^{- 15}

K_{s p} [C u (O H)_{2}] = 1.6 \times 10^{- 19}

Q. In a solution

0.04 M

F e {C l}_{2}

0.02 M

F e {C l}_{3}

0.01 M

H C l

, how large may be its

p H

(nearest integer) without there being precipitation of either

F e {(O H)}_{2}

F e {(O H)}_{3}

K_{s p}

F e {(O H)}_{2}

F e {(O H)}_{3}

8 \times 10^{- 16}

4 \times 10^{- 38}

Q. What is x in the reaction?

F e {S O}_{4} + x ⟶ {N a}_{2} {S O}_{4} + {F e (O H)}_{2}

Q. In the reaction

F e S O_{4} + x \to N a_{2} S O_{4} + F e (O H)_{2}, x

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