A 1.00-L aqueous solution contained 5.80 g of sodium hydroxide, NaOH. What was the pH of the soution at 25°C?

M1 * V1 = M2 * V2 2.5 M * 150 mL = 4.0 M * V2 Solving for V2 gives you 93.75 mL Take 93.75 mL of 4.0 M solution and dilute it to 150 mL.

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