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6 notecards = 2 pages (4 cards per page)

Viewing:

Prelab for Standardization of Sodium Hydroxide SD

front 1

About how many grams of KPH will you be using in each trial of this experiment?

back 1

0.2-0.3 grams

front 2

What acid-base indicator will you be using in this experiment?

back 2

Phenolphthalein

front 3

How will you know you reached the end point of your titration?

back 3

The color will change from colorless to pink as sodium hydroxide is added to KHP.

front 4

If 22.46 mL of an N a O H solution is need to neutralize 0.550 grams of KHP, what is the molarity of the N a O H solution assuming excess HCl was not added?

back 4

0.550 g KHP x (1 mol KHP / 204.22 g KHP) = 0.00269 mol KHP = 0.00269 mol H+

0.00269 mol NaOH x (1 / 22.46 mL NaOH solution) x (1000 mL / 1 L) = 0.120 M NaOH

Answer: 0.120 M

front 5

When titrating the KHP, what will you do if you added too much sodium hydroxide (several drops after it turns pink)?

back 5

Add additional hydrochloric acid drop wise until the solution turns clear and then add sodium hydroxide drop wise until the color just turns pink.

front 6

What safety equipment must you wear when performing this experiment?

back 6

All of the above