We had a lab where the standard solution was potassium hdrogenphthalate. In this we added 3 drops of phenolphtalein indicator and then we ran sodium hydroxide into the solution. We did four different flasks and the final readings for these then were 26.00 cm3, 32.00 cm3, 26.10 cm3 and 29.90 cm3. So, my question is how do I calculate the concentration of the hydrogenphthalate solution and the concentration of the sodium solution.

Question

We had a lab where the standard solution was potassium hdrogenphthalate. In this we added 3 drops of phenolphtalein indicator and then we ran sodium hydroxide into the solution. We did four different flasks and the final readings for these then were 26.00 cm3, 32.00 cm3, 26.10 cm3 and 29.90 cm3. So, my question is how do I calculate the concentration of the hydrogenphthalate solution and the concentration of the sodium solution.
Thanks on beforehand

Amanda · Answer

Just saw that I forgat to notice that the amount of potassium hydrogenphtalate was 5.12 grams. Also, it was enough with two readings within ± 0,01 cm3

DrBob222 · Answer

mols KHP = grams/molar mass mols NaOH = mols KHP M NaOH = mols NaOH/L NaOH