## Molar concentration of H3O

LeAirraBullingor2k
Posts: 77
Joined: Wed Mar 13, 2019 12:15 am

### Molar concentration of H3O

How do we calculate the molar concentration of H3O given just the Kw?

Angela Patel 2J
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

### Re: Molar concentration of H3O

You would have to know the concentration of OH- if that was the only information you are given.

Michael Nguyen 1E
Posts: 120
Joined: Sat Aug 17, 2019 12:17 am

### Re: Molar concentration of H3O

Depending on the information given in the question, you may have to use different equations to solve for [H3O+]. An equation that relates [H3O+] to Kw would be [H3O+][OH-]=Kw.

Tauhid Islam- 1H
Posts: 64
Joined: Fri Aug 02, 2019 12:15 am

### Re: Molar concentration of H3O

If you are just given Kw, then wouldn't the molar concentration of H3O be 1.0*10^-7?

Ryan Yoon 1L
Posts: 55
Joined: Mon Jul 01, 2019 12:15 am

### Re: Molar concentration of H3O

How do we calculate the molar concentration of H3O given just the Kw? Assuming that you are calculating the [h3o+] of pure water and it is at 25 degrees Celcius, the concentration of H3O+ be 1.0*10^-7.

Sean Cheah 1E
Posts: 105
Joined: Wed Sep 18, 2019 12:20 am

### Re: Molar concentration of H3O

Even if the temperature is not 25C, assuming that you are dealing with pure water, [H3O+] = [OH-] so $[H_{3}O^{+}] = \sqrt{K_{w}}$.

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

### Re: Molar concentration of H3O

If we assume that the concentrations of h3o+ and oh- is the same, the answer will be square root of kw which is 10^-7.