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Chapter 14: Q 25P (page 476)

Question:Does the magnitude of the free energy change for ATP hydrolysis increase or decrease as the pH increases from 5 to 6?

Short Answer

Expert verified

Answer

The amount of change in free energy grows.

Step by step solution

01

Step-by-step-solutionStep 1: Definition of ATP hydrolysis

Adenosine triphosphate (ATP) hydrolysis is a catabolic reaction process through which chemical energy that has been stored in the high-energy phosphoanhydride bonds in ATP is released after these bonds have been broken, for example in muscles, by generating work in the form of mechanical energy.

02

Step 2:Explanation whether the magnitude of free energy change increases or decreases

The size of the free energy shift increases with the propensity of ATP for hydrolysis. At pH5, there are more bonded hydrogen atoms, which enhances their charge-induced repulsion.

As repulsion grows, hydrolysis becomes more advantageous and the amount of free energy change increases, becoming more negative.

Therefore, the magnitude of free energy change increases.

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