Asked by Ruth
how many grams of potassium hydroxide would need to be added to 400 mL of 0.150M HNO3 to raise its pH to 2.5
Answers
Answered by
DrBob222
HNO3 + KOH ==> KNO3 + H2O
mols HNO3 = M x L = 0.06
pH = 2.5 means you want (H^+) to be 0.00316 or mols (H^+) = 0.00316 x 0.4L = 0.00126. That's mols (H^+) remaining which means you must neutralize the difference; i.e., 0.06 - 0.00126 = ?
Convert that to grams KOH.
mols HNO3 = M x L = 0.06
pH = 2.5 means you want (H^+) to be 0.00316 or mols (H^+) = 0.00316 x 0.4L = 0.00126. That's mols (H^+) remaining which means you must neutralize the difference; i.e., 0.06 - 0.00126 = ?
Convert that to grams KOH.
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