Wednesday, November 17, 2010

Basic chemistry: how much NaOH required to change pH of a 1 liter pH 4 solution?

How many milliliters of a 1 Molar NaOH solution would be required to change a 1 liter solution from pH 4 to pH 10?



How many grams of NaOH would this translate to?Basic chemistry: how much NaOH required to change pH of a 1 liter pH 4 solution?
1 liter of pH 4 solution is 10^-4 M in H+ = 0.1mmol of H+

pH 10 = 10^-4 M OH so adding 0.2 mL of 1 M NaOH will produce 0.2 mmoles of OH, neuralizing the 0.1 mmole of H+ and leaving 0.1 mmole of OH^-1 in 1000.2 mL 0.1 mmole of OH^-1 =10^-4 moles/1.002 liters = 0.00009998 M = 10^-4 M pOH = -log 10^-4 =4

pH =14-4 = 10

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