Question

The hydronium ion concentration in an aqueous solution is [H+] = 5.3 x10-4 M. What is the hydroxide ion concentration? Is this solution acidic or basic?

A.) [OH-] = 1.9 x10-11 M, acidic

B.) [OH-] = 4.7 x10-6 M, basic

C.) [OH-] = 1.1 x10-9 M, acidic

D.) [OH-] = 3.2 x10-8 M, acidic

Answer 1

Answer:a

Step-by-step explanation:

Given

`[H^+]=5.3* 10^(-4)\ M`

and
`pH+pOH=14`

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

therefore
`pH=-\log (5.3* 10^(-3))`

`pH=-(-4-\log (5.3))`

`pH=3.275`

Thus
`pOH=14-3.275`

`pOH=10.275`

and
`pOH=-\log [OH^(-)]`

`[OH]^(-1)=10^(-10.25)`

`[OH]^(-1)=1.88* 10^(-11)\ M`

As the pH is less than 7 therefore solution is acidic