Test Question Lower Tier 2

What is this piece of apparatus called?

• Pipette

• Burette

• Janette

• Cuvette

30cm³ of NaOH is neutralised by 12.3cm³ of 0.2mol/l HCl. What is the concentration of the NaOH?

• 82 mol/l

• 0.041 mol/l

• 0.49 mol/l

• 0.082 mol/l

I have 50cm³ of 0.1M HCl. How many moles of NaOH will I need to neutralise it?

• 5
• 0.5
• 0.05
• 0.005

The reaction of sulfuric acid (H₂SO₄) with Sodium hydroxide (NaOH) is described by the equation:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

50 mL of NaOH with unknown concentration is placed in a conical flask with bromthymol blue indicator. A solution of 0.20 M H₂SO₄ is added dropwise into the NaOH solution. After exactly 25.0 mL of H₂SO₄ is added, the indicator changes from blue to yellow. What is the concentration of the KOH?

• 0.20M

• 4.0M

• 2.5M

• 0.4M

The reaction of hydrochloric acid (HCl) with ammonia (NH₃) is described by the equation:

HCl + NH₃ → NH₄Cl

A student is titrating 100.0 mL of 0.10 M NH₃ with 0.5 M HCl. How much hydrochloric acid must be added to react completely with the ammonia?

• 20.0mL

• 500.0mL

• 100.0mL

• 5.0mL

Answer explanation

To completely react with 0.10 M NH3, 20.0 mL of 0.5 M HCl is needed. This is calculated using the equation C1V1 = C2V2.

What is this piece of apparatus called?

• Pipette

• Burette

• Janette

• Cuvette

acid + base ₋>

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

What does pH measure?

• Amount of Oxygen Ions
• Amount of Hydrogen Ions
• The amount of salt in a solution
• The density

A solution with a pH of 8.6 would be...

• Acid

• Base

• Neutral

• Acid and Base

Answer explanation

A solution with a pH of 8.6 is considered a Base because it falls within the basic range of pH values, which is above 7. Therefore, the correct choice is Base.

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

• To calculate the viscosity of the solution