Question: Why Does The Volume Of Water Added To Dissolve The Potassium Hydrogen Phthalate Khp Not Matter?

Why does it not matter how much water you add when dissolving the acid Khp?

Adding water does not affect your results, since you are measuring the amount of acid in solution, not the amount of water present.

Place a clean and dry 50-mL buret in a buret clamp.

If the buret is wet, you will need to rinse it out with a small amount of the NaOH solution..

Does it matter how much water you add in Step 1 of titration of the unknown acid Why or why not?

Any distilled water you add to this erlenmeyer will change its volume, but won’t change the amount of substance of acid inside it, neither the initial volume you added of the acid solution. Sometimes it’s even recommended that you add some water to make the color change more visible.

Why doesn’t the indicator affect the titration results?

In all titrations, the amount of indicator added to the solution to be titrated is just a small amount. … Since titration is not as sensitive as any instrumental methods, the low volume of the titrant consumed by the indicator is not that big of a deal because it would not be reflected on the final volume.

Why does the pink color disappear in a titration?

Phenolphthalein is an acid/base indicator. It is colorless when it is an acid and pink when it is a base. … When enough carbonic acid is formed it neutralizes the lime water, which is a base and makes the solution an acid. Therefore with the phenolphthalein, the color disappears in the now acidic solution.

Why is conical flask not rinsed with solution?

No, it is not right. Assuming the conical flask is the vessel in which the reaction takes place, it must be clean. If it is rinsed with distilled water, that’s fine. If it is rinsed with the solution under test that’s not fine – that will affect the number of molecules of reactant in the flask.

Why is it important to not add more than 3 drops of indicator?

It’s important to use only a few drops of indicator because if more of the indicator is used into the solution, it could change the pH since the indicator is a weak acid itself. We would ideal only want one or two drops because this would allow for the most accurate color change with the different salts.

Why is the volume of water not important in titration?

It does not affect the titration reading as water does not react with the reagents or change the number of moles of acid added.

Does Khp react with water?

KHP dissociates completely in water, giving the potassium cation (K+) and hydrogen phthalate anion (HP− or Hphthalate−). And then as a weak acid hydrogen phthalate reacts reversibly with water to give hydronium (H3O+) and phthalate ions. … KHP is also a useful standard for total organic carbon (TOC) testing.

Why distilled water does not affect titration?

Distilled water does not affect the outcome of titrations because it is only a solvent.

What happens if you overshoot the endpoint in titration?

Terms in this set (3) If you overshoot the endpoint in titration of the KHP, an error will happen in your calculations for the molarity of NaOH you are standardizing. … Adding more of the base needed to reach the equivalence would mean you have higher volume which will make the calculated concentration of NaOH lesser.

Why is distilled water used in titration?

with distilled water so that all of the titrant gets into the reaction mixture. You can use a pipette to do this. Addition of small to moderate amounts of distilled water will not change the results of your titration. once or twice with distilled water and then once or twice with the solution to be used.

Why is burette rinsed with acid before titration?

This rinsing ensures that there is no residual water to dilute the titrant when the burette is filled.

How can you tell if you’ve overshot your endpoint?

The endpoint of the titration is signaled when a permanent color change is observed (longer than 30 seconds). It is possible to overshoot the endpoint by adding too much titrant. A correct endpoint is shown on the left, an overshot endpoint on the right.

How do you know if the titration went past the endpoint?

Swirl the flask of analyte while adding titrant from the buret. (The analyte is the chemical you are testing in the titration, while the titrant is the standard you are adding.) … Once the solution begins to change color and the new color persists for at least 30 seconds, you have reached the end point of your titration.

Why does adding distilled water not affect molarity?

Adding water to a titrant or analyte will change the concentration of that solution. … When you add water to a solution, the number of moles of the solvent stays the same while the volume increases. Therefore, the molarity decreases; the solution is diluted.

Why do you dilute a solution before titration?

A solution used for titration needs to be dilute enough for allow an error of 2 drops(0.1 ml) to be added without causing a major error in measuring the concentration of the titrable analyte. If a solution is concentrate a drop extra will cause a large error.

Why is it important to ensure the tip of the burette is filled?

The meniscus, the bottom of the water level in the burette, should be level with the zero mark. Filling the burette this way is also useful because it means the space under the tap is also filled with liquid. This is important, as the burette is calibrated to include this volume.