Question detail

Case 42 ratio-step. A balanced equation is used in a calculation. Which interpretation is safest? Focus on ratios fractions and percentages titration calculations in Concentrations in mol/dm3 and titration calculations, not on a neighbouring Unit 4.3 idea.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)

Question

A. Case 42 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for ratios fractions and percentages titration calculations
B. Case 42 ratio-step: Treat subscripts inside a formula as reacting mole ratios (Concentrations in mol/dm3 and titration calculations)
C. Case 42 ratio-step: Assume every reactant and product always has a 1 to 1 ratio (ratios fractions and percentages titration calculations)
D. Case 42 ratio-step: Use the largest mass as the limiting amount without mole comparison (Using concentrations of solutions in mol/dm3 (chemistry only) (HT only))

Answer

The correct option is Case 42 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for ratios fractions and percentages titration calculations.

Explanation

The correct option is Case 42 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for ratios fractions and percentages titration calculations. It supports the approved learning objective by keeping the method tied to ratios fractions and percentages titration calculations in Concentrations in mol/dm3 and titration calculations. The other options are incorrect because they either use the wrong quantitative relationship, lose the required unit, confuse coefficients with subscripts, or report an answer without a complete worked method.

Common mistake

Misunderstanding Ratios in Titration Calculations

Students often confuse the ratios of reactants in titration calculations, leading to incorrect concentration results.

To fix this, carefully identify the coefficients from the balanced equation and apply them correctly to the mole ratios when calculating concentrations.

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For Concentrations in mol/dm3 and titration calculations, which amount relationship answer best supports this Unit 4.3 objective: (chemistry only) (HT only) Use ratios, fractions and percentages in titration calculations. (MS 1c)?