(a) 0.03 mole of Ca ions are added to a litre of 0.01 M SO, 9-solution. Will itcause preeipitation of Caso, ? Ksp for CaSO, = 24 x 10-(b) The ionization constant of propanoic acid is 1.32 10- Calculate the degreeof dissociation of propanoic acid in its 0.05 M solution. Calculate the concentrationof ICH,CH,C00) ions in the solution and its pH.[Given log 81 = 1.9, log 9 = 0.9542)
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Answer:
Correct option is
B
50 g
We know that CaCO
3
contains 1 mole of both Ca
2+
and CO
3
2−
ions that is, 6.02×10
23
ions of both the ions.
Now, since the number of ions in the question is given to be 3.01×10
23
which is half of 6.02×10
23
, hence, the number of moles will also get halved.
Since we know that moles=
Molecular mass
Given mass
Therefore,
2
1
=
100
Required mass of CaCO
3
Required mass of CaCO
3
=50g
Hence, option (b) is correct.
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