Chem 131

What is this piece of apparatus called

• Pipette

• Burette

• Janette

• Cuvette

Acid + Base ₋--> 

• salt + hydrogen
• salt + water
• salt + carbon dioxide + water
• salt

What indicator is commonly used in titrations?

• Phenolphthalein
• Bromothymol Blue 
• Litmus
• Universal 

What is the white tile/paper for in a titration experiment?

• To help clearly see the color change

• To protect the conical flask

• To add extra height

• To assist the reaction

what is the reading on this burette?

• 4.40mL
• 3.50mL
• 3.60mL
• 4.50mL

A lab group completes three runs of a standardization of NaOH. The calculated molarity of each run is 1.002 M, 1.012 M, 1.008 M. What is the percent deviation of the second run?

• 0.3349 %

• 1.005 %

• 0.4965 %

• 0.6651 %

What is the main purpose of acid-base titrations?

• To test if reactants react.

• To calculate the concentration of unknown analyte.

• To calculate the concentration of known analyte.

• To test quality of reactants.

What is an equivalence point?

• It is the point when enough analyte has been added.

• It is the point when the amount of added titrant is equal to the amount of analyte in the solution.

• It is the point when the volume of titrant is equivalent the volume of analyte.

• It is the point when the concentration of titrant added is equivalent to the volume of analyte.

The following neutralization reaction occurs in the lab.

HCl + KOH --> H₂O + KCl

If a student uses 2.50 g of HCl powder to form a solution, that is neutralized by 12.5 mL of KOH. What is the molarity of the potassium hydroxide?

• 5.49 M

• 0.857 M

• 12.5 M

• 0.00729 M

Consider the following neutralization reaction:

2HCN (aq) + CaCO₃ (s) ---> Ca(CN)₂ (aq) + CO₂ (g) + H₂O (l)

What is the Molarity of a hydrocyanic acid solution if 34.80 mL is needed to neutralize 0.9604 g of calcium carbonate?

• 0.5515 M

• 1.813 M

• 0.2758 M

• 0.1379 M