The reactions given are: 2 aq aq aq 2 aq aq aq H S H HS HS H S We can write the overall reaction as follows: 2 2 aq aq aq H S S 2H We have to find the value of K for 2 2 aq aq aq S 2H H S which is the reverse of the above reaction. For the reaction 2 aq aq aq H S H HS , it is given that 8 1 K 9.5 10 x And for the reaction, 2 aq aq aq HS H S it is given that 19 2 K 1.0 10 x So, on combining this reaction the value of K = 1 2 K K x 8 19 27 K 9.5 10 1.0 10 K 9.5
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