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Question

Calculate the molarity of each of the ions in a solution when 3.0 litre of 4.0 M NaCl and 4.0 litre of 2.0 M CaCl2 are mixed and diluted to 10 litre.

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Solution

moles of Na+ ions =3x4 =12
Total volume = 10L
Molarity of Na+ ions =1210 =1.2M
Moles of Ca2+ ions = 2x4 =8
Therefore , molarity of Ca2+ ions =0.8M
Moles of Cl ions =3x4 +2x4x2 =28
Molarity of Cl ions =2810=2.8M


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