Titration Curves

What is the pH at the equivalence point.

• The pH is approximately 5

• The pH is approximately 6

• The pH is approximately 8

• The pH is approximately 9

The pH of the solution when the buffer solution in the flask contains equal concentrations of weak acid and conjugate base is

• 2.86

• 4.75

• 8.77

• 12.01

I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?

• 0.8 M
• 1 M
• 1.25 M

Tags

NGSS.HS-PS1-7

What is the endpoint of a titration

• Where the amount of acid and base are equal as shown by a colour change 
• Where there is no base
• When the volume of base in the burette is used up 
• When there is no acid

What is the volume in this burette?

• 24.1mL
• 24.3mL
• 24.2L
• 24.2mL

1) 0.04 M NaOH is load into a buret - initial reading is 4.5 mL
2) 60 mL of unknown acid is placed under the buret.
3) 2 drops of phenolphthalein is added to the acid.
4) The base is slowly added to the acid until it turns pink. - final reading from the buret is 34.6 mL.
WHAT IS THE MOLARITY OF THE ACID?

• 0.04 M
• 0.0012 M
• 0.02 M
• 30.1 M

If 100 mL of 0.1 M solution is diluted to 550 mL what is the concentration?

• 0.02 M 
• 0.04 M
• 0.1 M
• 0.003 M

Which of the following is a conjugate acid/base pair?

• HCl/OCl^-
• H₂SO₄/SO₄^2-
• NH₄⁺/NH₃
• H₃O⁺/OH^-

In which of the following reactions does H₂PO₄^- act as an acid?

• H₃PO₄ + H₂O --> H₃O⁺ + H₂PO₄^-
• H₂PO₄^- + H₂O --> H₃O⁺ + HPO₄^2-
• H₂PO₄^- + OH^- --> H₃PO₄ + O^2-
• The ion cannot act as an acid

Identify the strongest acid

• HCN
• H₂O
• CH₃OH
• HNO₃

Tags

NGSS.HS-PS1-1