18 flashcards · Shared on 19 August 2026 by AtomAI Library
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Which equation relates amount in moles, mass and molar mass?
n = m ÷ M
Which equation relates amount in moles, mass and molar mass?
n = m ÷ M
How many moles of solute are present in 150 cm³ of a 0.200 mol dm⁻³ solution?
0.0300 mol
Hydrochloric acid reacts with sodium hydroxide in a 1:1 mole ratio. If 25.0 cm³ of 0.100 mol dm⁻³ HCl reacts with 20.0 cm³ of NaOH, what is the NaOH concentration?
0.125 mol dm⁻³
Calcium carbonate reacts according to CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O. How many moles of HCl react completely with 0.010 mol of CaCO₃?
0.020 mol
Which equation can be used when a solution is diluted without changing the number of moles of solute?
c₁V₁ = c₂V₂
A 50.0 cm³ sample of 2.00 mol dm⁻³ solution is diluted to a total volume of 250 cm³. What is the new concentration?
0.400 mol dm⁻³
What is the endpoint of an acid–base titration?
The observed point at which the indicator changes colour
How many moles are present in 14.6 g of sodium chloride, NaCl, with a molar mass of 58.5 g mol⁻¹?
0.250 mol
A solution contains 0.50 mol of solute in 250 cm³. What is its concentration?
2.0 mol dm⁻³
A sulfuric acid solution contains 9.8 g dm⁻³ of H₂SO₄. Given that its molar mass is 98 g mol⁻¹, what is its molar concentration?
0.100 mol dm⁻³
In a titration calculation, what gives the reacting mole ratio?
The coefficients in the balanced chemical equation
Sulfuric acid reacts according to H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. What concentration of NaOH is needed if 20.0 cm³ neutralizes 25.0 cm³ of 0.100 mol dm⁻³ H₂SO₄?
0.250 mol dm⁻³
Which expression gives concentration in mol dm⁻³?
Concentration = moles ÷ volume in dm³
What conversion is needed before using a volume measured in cm³ in a molar concentration calculation?
Divide the volume by 1000 to obtain dm³
How is mass concentration in g dm⁻³ related to molar concentration?
Mass concentration = molar concentration × molar mass
Three titres are 24.60 cm³, 24.65 cm³ and 25.40 cm³. Which mean titre should be used, treating the third result as an outlier?
24.63 cm³
What is one mole of a substance?
The amount containing 6.02 × 10^23 specified particles
What is the equivalence point of a titration?
The point at which the reactants have been mixed in the exact stoichiometric ratio