100 mL of a 1 M NaCl solution is mixed with 100 mL of a 3 M HCl solution and 200 mL of a 1 M CaCl2 solution. Which of the following statements is true?
A
The ratio of concentrations of cations to anions is 34
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B
The ratio of cations to anions is 2
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C
Molarity of Cl−=12M
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D
Molarity of Cl−=32M
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Solution
The correct option is A The ratio of concentrations of cations to anions is 34 Molarity=number of moles of solutevolume of solution in mL×1000
Moles ofNaCl=1×1001000=0.1
Moles ofHCl=3×1001000=0.3
Moles ofCaCl2=1×2001000=0.2
Moles of cations in the mixed solution =moles ofNa++H++Ca2+ Total moles of cations=0.1+0.3+0.2=0.6
Similarly, Moles of anions in the mixed solution =moles ofCl−fromNaCl+Cl− fromHCl+Cl−fromCaCl2 Total moles of anions=0.1+0.3+(2×0.2)=0.8 Ratio of cations to anions =0.60.8=34 Molarity of Cl−= 0.8×1000400= 2M