Volumetric analysis calculations

Question 1 of 10

A primary standard should be

Question 2 of 10

Mass concentration in g/dm³ equals

Question 3 of 10

Moles of solute in 25.0 cm³ of 0.2 mol/dm³ acid = ___ mol.

Question 4 of 10

A 0.25 mol/dm³ solution of KOH has what mass concentration?

Question 5 of 10

20 cm³ of 0.2 mol/dm³ H₂SO₄ neutralised 25.0 cm³ of NaOH. H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. Find the concentration of the NaOH.

Question 6 of 10

The end point of a titration is the point at which

Question 7 of 10

Moles of solute in 20.0 cm³ of 0.2 mol/dm³ acid = ___ mol.

Question 8 of 10

2.65 g of anhydrous sodium carbonate was dissolved in water and made up to 250 cm³. 25.0 cm³ of this solution required 25 cm³ of hydrochloric acid for neutralisation using methyl orange. Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂ (Na₂CO₃ = 106) Calculate (a) the concentration of Na₂CO₃ in mol/dm³, (b) the moles of Na₂CO₃ in 25.0 cm³, (c) the concentration of HCl in mol/dm³, (d) the concentration of HCl in g/dm³ (HCl = 36.5).

Question 9 of 10

Methyl orange is yellow in acid.

Question 10 of 10

The pipette should be rinsed with