[skandalism]

Hi
We had a lab where the standard solution was potassium hydrogenphthalate. 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

[curiouscat]

Hi
We had a lab where the standard solution was potassium hydrogenphthalate. 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.

You can't. You have too many unknowns.

It's called a standard for a reason.

[skandalism]

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

[Borek]

You don't have two readings within 0.01 mL, your volumes are so far from each other you could as well throw a dice.

But I am almost sure you are still ignoring/missing some parts of the procedure. Was it 5.12g of KHP in each flask?