Titrations

What is the impact of adding small volume of water to the KHP in the Erlenmeyer in Part A?

• dilutes KHP so less base solution required to neutralize

• need to add a lil bit more KHP to even things out

• must redo titration

• no impact; only need approximate KHP solution volume for Part A

Tags

NGSS.HS-PS1-5

If the Erlenmeyer flask contains acidic solution and a few drops of phenolphthalein, its color will be

• pink

• blue

• red

• colorless

What is the reading on this burette?

• 4.40mL

• 3.50mL

• 3.60mL

• 4.50mL

A titration works by using a ___________________________ reaction.

• Single Replacement

• Neutralization

• Combustion

• Synthesis

Why do we perform a titration?

• To determine the concentration of an unknown solution

• To see if a reaction will occur between an acid and base

• To find the mass of an unknown acid

• To find the molar mass of an unknown solution

Tags

NGSS.HS-PS1-5

A 25.0 mL sample of HCl was titrated to the endpoint with 15.0 mL of 2.0 mol/L NaOH. What is the concentration of HCl?

• 1.6 mol/L

• 0.03 mol/L

• 0.6 mol/L

• 1.2 mol/L

Indicators are used in a titration by changing ___________________ at different pH levels.

• smell

• shape

• phase

• color

What allows us to know when the end point has been reached?

• Bubbles

• Feels warm

• indicator changing color

• Turns to a solid

I have 25mL of 1.0 mol/L HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?

• 0.8 mol/L

• 1 mol/L

• 1.25 mol/L

What is the molar ratio of sulfurous acid to hydroxide in the following equation: H₂SO_3(aq) + OH^-_(aq) —> HSO₃^-_(aq) + H₂O_(l)

• 2 : 3

• 1 : 1

• 3 : 2

• 1 : 2