Answer» The is  Explanation: pH or POH is the measure of acidity or alkalinity of a solution. pH is CALCULATED by taking negative logarithm of hydrogen ION concentration. Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7. ![pH=-\log [H_3O^+] pH=-\log [H_3O^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5BH_3O%5E%2B%5D)
Putting in the values: ![4.30=-\log[H_3O^+] 4.30=-\log[H_3O^+]](https://tex.z-dn.net/?f=4.30%3D-%5Clog%5BH_3O%5E%2B%5D)
![[H_3O^+]=antilog(-4.30) [H_3O^+]=antilog(-4.30)](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D%3Dantilog%28-4.30%29)
![[H_3O^+]=5.01\times 10^{-5}M [H_3O^+]=5.01\times 10^{-5}M](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D%3D5.01%5Ctimes%2010%5E%7B-5%7DM)
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