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CBSE Class 11-science Answered

Find the ratioof molar amount of H2S needed to precipitise metal ions from 20ml each of 1M Cd(NO3)2 and 0.5M CuSO4

Asked by Sridhar | 16 May, 2019, 12:05: PM
Expert Answer
Chemical equations-
 
left parenthesis 1 right parenthesis space straight H subscript 2 straight S plus Cd left parenthesis NO subscript 3 right parenthesis subscript 2 rightwards arrow CdS plus 2 HNO subscript 3
space space space space space space space 1 space space space space space space space space space space space space space 1 space space space space space space space space space space space space space space 1 space space space space space space space space space space 1

Moles space of space Cd left parenthesis NO subscript 3 right parenthesis subscript 2 equals 1 over 1000 cross times 20 equals 0.02 space mole
So space according space to space stoichiometry space of space chemical space equation comma space moles space of space straight H subscript 2 straight S space needed equals 0.02 space moles

left parenthesis 2 right parenthesis straight H subscript 2 straight S plus CuSO subscript 4 space rightwards arrow CuS plus straight H subscript 2 SO subscript 4
space space space space space space space 1 space space space space space space space space space space space space 1 space space space space space space space space space space space 1 space space space space space space space space space space 1

Moles space of space CuSo subscript 4 space equals fraction numerator 0.5 over denominator 1000 end fraction cross times 20 equals 0.01 space mole

Hence comma space according space to space the space above space reaction comma space moles space of space straight H subscript 2 straight S space needed equals 0.01 space moles

Therefore comma space the space ratio space of space molar space amount space of space straight H subscript 2 straight S space needed space will space be equals 0.02 colon 0.01 equals 2 colon 1
Answered by Ravi | 16 May, 2019, 06:03: PM
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