lab final conceptual

Question 1

Why is it important to not have bubbles in the tip of the buret?

Answer 1

the volume measurement will be inaccurate and the actual volume of the titrant will be lower than the measured volume

Question 2

You add the weighed KHP to a flask containing a 60 mL of water rather than 50 mL of water.

What will happen to the calculated concentration of NaOH

Answer 2

it will be unaffected

Question 3

The buret is still wet with water on the inside when you add your NaOH solution.

What will happen to the calculated concentration of NaOH?

Answer 3

too low

Question 4

. The KHP is wet when you weigh it.

What will happen to the calculated concentration of NaOH?

Answer 4

it will be too high

Question 5

. You titrate past the equivalence point by 0.50 mL.

What will happen to the calculated concentration of NaOH?

Answer 5

it will be too low because the higher liters added will make the molarity smaller

Question 6

are salts soluble and are they strong or weak electrolytes?

Answer 6

they are soluble and are strong electrolytes

Question 7

are organic molecules strong or weak electrolytes?

Answer 7

they are non electrolytes

Question 8

You will pipet 25.00 mL of Ca(OH)2 solution into an Erlenmeyer flask. Does the Erylenmeyer flask need to be dry? Explain.

Answer 8

The Erlenmyer flask should be clean but any remaining DI water will not affect when the equivalence point is reached.

Question 9

You will pipet 25.00 mL of Ca(OH)2 solution. Does the pipet need to be dry? Explain.

Answer 9

The pipet is already filled with DI water, it does not need to be dry but it does need to be conditioned with the appropriate solution.

Question 10

How does K2CO3 behave in water?

Answer 10

salt, weak base

strong electrolyte

Question 11

There was Ca(OH)2 solid (that was not filtered off) in your solution to be titrated. what happens to the ksp you calculated?

Answer 11

it is too high

Question 12

You measured 24.00 mL of Ca(OH)2 solution instead of 25.00 mL. What happens to the ksp?

Answer 12

the ksp with 24.00 ml would have been higher so our calculation is too low

Question 13

The HCl concentration was actually lower than the reported molarity on the bottle. What happens to the ksp?

Answer 13

the ksp would have been lower so our calculation is too high

Question 14

whats the solubility of Benzoic Acid C6H5COOH

Answer 14

slightly soluble

Question 15

whats the solubility of Sucrose/Glucose C6H12O6

Answer 15

soluble