Question

Which base is the strongest?

[H+] = 1 X 10-9
[H+] = 1 X 10-11
[H+] = 1 X 10-10
[H+] = 1 X 10-12

Answer 1

Im assuming that 10-9, 10-10... is 10 to the power of 9 and 10 to the power of 10, respectively.

In the pH scale, acids are pH<7 and bases have pH>7. Each increase in pH makes something less acidic (or more basic) by 10.
Therefore [H+]=1x10^12 is the most basic

Answer 2

The strong base is with
`H^+` concentration equals to
`1 * 10^(-12) M`.

Step-by-step explanation:

The pH of the solution is defined as negative logarithm of
`H^+` ions in a solution.Higher the
`H^+` ions concentration lower will be the value of pH and more acidic will be the solution.

`pH=-\log[H^+]`

1)
`[H+] = 1 * 10^(-9) M`

`pH=-\log[1 * 10^(-9) M]=9` Most acidic solution

2)
`[H+] = 1 * 10^(-11) M`

`pH=-\log[1 * 10^(11) M]=11`

3)
`[H+] = 1 * 10^(-10) M`

`pH=-\log[1 * 10^(-10) M]=10`

4)
`[H+] = 1 * 10^(-12) M`

`pH=-\log[1 * 10^(-12) M]=12` Most basic solution