The pH scale is used by chemists to measure the acidity of a solution. It is a base 10 logarithmic scale. The pH, P, of a solution and its hydronium ion concentration in moles per liter, H, are related as follows:
H = 10
-PFind the formula for the rate of change

.
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= -

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= (ln 10 )10
-P◦

= -(ln 10 )10
-P◦

= -(ln P)10
-P