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Topic 5.8-5.18 - Quantitative analysis

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Total cards: 12•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

How do you calculate the concentration of solutions in mol dm–3 ?

Back (Answer)

Concentration​ ​of​ ​a​ ​solution​ ​can​ ​be​ ​measured​ ​in​ ​moles​ ​per​ ​given​ ​volume​ ​of solution​ ​e.g.​ ​moles​ ​per​ ​dm3​ ​​ ​(mol/dm3​ )​ To​ ​calculate​ ​moles​ ​of​ ​solute​ ​in​ ​a​ ​given​ ​volume​ ​of​ ​a​ ​known​ ​concentration​ ​use moles​ ​=​ ​conc​ ​x​ ​vol​ ​i.e.​ ​mol​ ​=​ ​mol/dm3​ ​​ ​x​ ​dm​3​​

#2
Front (Question)

How do you convert concentration in g dm–3 into mol dm–3 and vice versa?

Back (Answer)

g​ ​dm​-3​​ ​->​ ​mol​ ​dm​-3​​ ​divide​ ​by​ ​molar​ ​mass/relative formula mass ​in​ ​grams mol​ ​dm​ ​ ​→​ ​g​ ​dm​ multiply​ ​by​ ​molar​ ​mass/relative formula mass ​in​ ​grams

#3
Front (Question)

Describe how to carry out an accurate acid-alkali titration, using burette, pipette and a suitable indicator

Back (Answer)

○ add​ ​acid​ ​to​ ​burette​ ​using​ ​a​ ​funnel,​ ​record​ ​the​ ​volume​ ​in​ ​the​ ​burette​ ​to start ○ add​ ​known​ ​volume​ ​of​ ​alkali​ ​to​ ​a​ ​conical​ ​flask​ ​and​ ​add​ ​some​ ​indicator ○ place​ ​conical​ ​flask​ ​on​ ​white​ ​tile​ ​(so​ ​you​ ​can​ ​see​ ​colour​ ​change​ ​clearly) ○ add​ ​acid​ ​to​ ​alkali​ ​until​ ​you​ ​reach​ ​the​ ​end​ ​point ○ calculate​ ​how​ ​much​ ​acid​ ​has​ ​been​ ​added​ ​(titre) ○ repeat​ ​until​ ​you​ ​get​ ​concordant​ ​titres

#4
Front (Question)

How would you calculate an unknown concentration of a solution using the results of a titration?

Back (Answer)

if​ ​you​ ​only​ ​knew​ ​the​ ​concentration​ ​of​ ​the​ ​acid​ ​and​ ​wanted​ ​to​ ​calculate​ ​the concentration​ ​of​ ​the​ ​alkali: ○ calculate​ ​moles​ ​of​ ​acid​ ​using​ ​moles​ ​=​ ​concentration​ ​x​ ​volume ○ calculate​ ​the​ ​mole​ ​ratio​ ​of​ ​acid​ ​to​ ​alkali​ ​using​ ​the​ ​equation​ ​for​ ​the reaction ○ work​ ​out​ ​how​ ​many​ ​moles​ ​of​ ​alkali​ ​you​ ​have​ ​using​ ​the​ ​mole​ ​ratio​ ​and moles​ ​of​ ​acid​ ​(e.g.​ ​if​ ​you​ ​have​ ​5​ ​moles​ ​of​ ​acid​ ​and​ ​the​ ​ratio​ ​of​ ​acid​ ​to alkali​ ​is​ ​1:2,​ ​you​ ​will​ ​have​ ​10​ ​moles​ ​of​ ​alkali) ○ calculate​ ​the​ ​concentration​ ​of​ ​the​ ​alkali​ ​using​ ​concentration​ ​=​ ​mol​ ​/ volume

#5
Front (Question)

What is the calculation for percentage yield?

Back (Answer)

Percentage yield = actual yield/theoretical yield x 100

#6
Front (Question)

Why is the actual yield of a reaction usually less than the theoretical yield?

Back (Answer)

Due to: * Incomplete reactions * Practical losses during the experiment * Competing, unwanted reactions (side reactions)

#7
Front (Question)

What is the calculation for atom economy?

Back (Answer)

atom​ ​economy​ ​=​ ​(Mr​ ​of​ ​desired​ ​product​ ​from​ ​reaction​ ​/​ ​sum​ ​of​ ​Mr​ ​of​ ​all reactants)​ ​x​ ​100 Mr = relative formula mass

#8
Front (Question)

Why may a particular reaction pathway be chosen to produce a product?

Back (Answer)

Based on whether it has high atom economy, high yield, fast rate, equilibrium position to the right and useful by-products

#9
Front (Question)

What is the molar volume?

Back (Answer)

The volume occupied by one mole of molecules of any gas at room temperature and pressure

#10
Front (Question)

How can you use a balanced equation with a molar volume to calculate the mass of a solid?

Back (Answer)

○ calculate​ ​moles​ ​of​ ​the​ ​reactant if​ ​given​ ​a​ ​volume:​ ​moles​ ​=​ ​volume​ ​÷​ ​24 ● work​ ​out​ ​the​ ​mole​ ​ratio​ ​and​ ​so​ ​work​ ​out​ ​how​ ​many​ ​moles​ ​of​ ​the​ ​product you​ ​have ● calculate​ ​mass ​using​ ​moles: mass=moles​ ​x​ ​molar​ ​mass

#11
Front (Question)

How can you use a balanced equation with a molar volume to calculate the volume of a gas?

Back (Answer)

○ calculate​ ​moles​ ​of​ ​the​ ​reactant if​ ​given​ ​a​ ​mass:​ ​moles=mass​ ​÷​ ​formula​ ​mass if​ ​given​ ​a​ ​volume:​ ​moles​ ​=​ ​volume​ ​÷​ ​24 ● work​ ​out​ ​the​ ​mole​ ​ratio​ ​and​ ​so​ ​work​ ​out​ ​how​ ​many​ ​moles​ ​of​ ​the​ ​product you​ ​have ● calculate​ ​volume​ ​using​ ​moles for​ ​calculating​ ​volume: volume=moles​ ​x​ ​24

#12
Front (Question)

How would you use Avogadro’s law to calculate the volume of a gas?

Back (Answer)

Avagadro’s law (6.02 x 10^23) x the number of moles