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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: moreche28 on May 17, 2021, 02:58:37 AM

Title: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
Post by: moreche28 on May 17, 2021, 02:58:37 AM

Hi.

I've got a problem to solve. Please, can anyone help?
It's the following: How many grams of KOH must be dissolved in 10 L of water to raise its pH to 11.5?

Thank you in advance.

Title: Re: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
Post by: Borek on May 17, 2021, 05:17:00 AM

Please read the forum rules (https://www.chemicalforums.com/index.php?topic=65859.0).

You have to show your attempts at answering the question/solving the problem to receive help, it is a forum policy.

Title: Re: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
Post by: Orcio_87 on May 22, 2021, 02:02:33 PM

@armim003

1. Calculate concentration of OH- in solution with pH = 11,5.
2. Calculate mass concentration (g KOH / liter of solution).
3. For 10 liters of water, quantity of KOH is 10 times bigger.