Sucrose , which is commonly known as table sugar, reacts in dilute acid solution

Question

Sucrose , which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6 At 23C and in 0.5M HCL , the following data were obtained for the disappearance of sucrose: Time(min C2H12O11 (M) 0 0.316 39 0.274 80 0.238 140 0.190 210 0.146 What is the value of the rate constant?

Explanation / Answer

this is a first order reaction. sucrose --> glucose and fructose for a first order reaction, [sucrose] = [sucroseº] - kt at T = 0, there is 0.316M sucrose at T39, 0.274M sucrose 0.146M = 0.316M - k(210seconds) k = 8.1x10^-5M/sec

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