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ICSE Class 9 Answered

25.3 of sodium carbonate Na2CO3 is dissolved in enough water to make 250 ml of solution
. If sodium carbonate dissociates completely , molar concentration of sodium ions Na+ and
carbonate ions CO2- are respectively (Molar mass of Na2CO3 = 106 g mol-1)?
                           3 
Asked by vikasg13.hardware | 11 Nov, 2017, 10:58: AM
answered-by-expert Expert Answer
No. space of space moles space of space Na subscript 2 CO subscript 3 space equals fraction numerator Weig h t over denominator molecular space weight end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 25.3 over denominator 106 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 0.239 space moles molarity space of space solutuon space space space equals space fraction numerator No. space of space moles space of space sol u te over denominator volume space of space solution space in space litre end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 0.239 over denominator 0.25 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 0.956 space mol divided by lit space space space space space space space Na subscript 2 CO subscript 3 space rightwards arrow space 2 Na to the power of plus space plus space CO subscript 3 to the power of negative 2 end exponent space space space space therefore space Conc space of space CO subscript 3 to the power of negative 2 end exponent space equals space 0.956 space mol divided by lit space space space space space space space space Conc space of space space 2 Na to the power of plus space space equals space 2 cross times 0.956 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.912 space mol divided by lit
Answered by Varsha | 11 Nov, 2017, 02:37: PM
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