Question

A 100 mL solution of 0.200 M Sr(OH)₂ is titrated with 0.100 M H₃PO₄. What is the volume of H₃PO₄ needed to reach equivalence point?

100 mL

200 mL

50 mL

300 mL

133 mL

A 100 mL solution of unknown concentration H₂SO₄ is titrated with 200 mL of 0.100 M Ba(OH)₂ solution to reach equivalence point. What is the concentration of H₂SO₄ solution?

0.100 M

0.050 M

0.020 M

0.200 M

Cannot determine based on the provided information.

Answer 1

1)

Strontium hydroxide is a strong base.

Number of mmol of

Note: Molalrity is number of moles of solute per liter of solution or number of milli-moles of solute per mL of solution

Number of mmol of hydroxide ions

Number of mmol of protons neutralised by

Strontium hydroxide has two hydroxide ions that can neutralise two protons.

Phosphoric acid has 3 protons

Number of millimoles of that can be neutralsied

Volume of 0.100 M required

2)

Number of millimoles of

Number of millimoles of