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### Topic: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5  (Read 631 times)

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#### moreche28

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##### Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
« 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?

#### Borek

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##### Re: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
« Reply #1 on: May 17, 2021, 05:17:00 AM »

You have to show your attempts at answering the question/solving the problem to receive help, it is a forum policy.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

#### Orcio_87

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##### Re: Calculating the mass of KOH needed to raise the pH(of H2O) to 11.5
« Reply #2 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.