# logarithmic formula that gives the pH of a substance

Part 1: Using the Library, web resources, and/or other materials, find the logarithmic formula that gives the pH of a substance. State what each variable in your equation represents.

Find the pH of a substance of your choice that is alkaline (basic). Using this pH, show how to find the hydrogen ion concentration, [H+], of the substance using the formula. Discuss the meaning of pH and [H+], the pH scale and why your chosen substance is alkaline. Use scientific notation or enough decimal places so that your answer has at least 3 place values. For example, either use 3.44*10-9 or 0.00000000344.

Part 2: Part 1: Suppose that the number of new homes built, H, in a city over a period of time, t, is graphed on a rectangular coordinate system where time is on the horizontal axis. Suppose that the number of homes built can be modeled by an exponential function, H= p * at , where p is the number of new homes built in the first year recorded. If you were a home builder looking for work, would you prefer that the value of a to be between 0 and 1 or larger than 1? Explain your reasoning.

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#### Solution Preview

Part 1:

(a) pH = - log 10 [H+], where [H+] is the Hydrogen ion concentration in moles per liter

(b) pH of blood is pH ï‚» 7.4

This value is quite ...

#### Solution Summary

A complete and neat solution is provided in the attached Word file with a sample graph and explanation.