Question

Which compound in each pair is more soluble in water?(a) Magnesium hydroxide or nickel(II) hydroxide

Answer 1

What is called compound?

• In chemistry, a compound is a substance made up of two or more different chemical elements combined in a fixed ratio.
• When the elements come together, they react with each other and form chemical bonds that are difficult to break.
• These bonds form as a result of sharing or exchanging electrons between atoms.

a) Mg(OH)2 or Ni(OH)2.

Mg(OH)2 1.8×10–11

Ni(OH)2 2.0×10–15

Clearly, Ksp value for Mg(OH)2 is higher , meaning it is MUCH MORE SOLBULE than Nickel

therefore, choose Mg(OH)2.

b)

PbS 3×10–28

CuS 6×10–37

Clearly, PbS is much more soluble than CuS

since Ksp is higher .

c)

Ag2SO4 1.4×10–5

MgF2 3.7×10–8

Clearly, Ag2SO4 has higher Ksp, so it is much more soluble.

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