Titration calculations
12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-PS1-7, NGSS.SEP 5 · England: GCSE Chemistry: Chemical changes (titrations, Higher)
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Question 1
25 cm³ of 0.5 mol/dm³ sodium hydroxide is neutralised by 15 cm³ of hydrochloric acid. HCl + NaOH → NaCl + H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
Question 2
Why is acid added dropwise near the end point?
- A. to avoid adding too much past the end point
- B. to make the indicator brighter
- C. because drops react faster
- D. to keep the burette full
Question 3
Titres (cm³): rough 24.93, run 1 23.88, run 2 23.78. Ignoring the rough titre, calculate the mean titre from the concordant results (within 0.10 cm³), in cm³. Give 2 decimal places.
Answercm³
Question 4
25 cm³ of 0.5 mol/dm³ sodium hydroxide is neutralised by 20 cm³ of sulfuric acid. H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
Question 5
Why is acid added dropwise near the end point?
- A. to keep the burette full
- B. because drops react faster
- C. to make the indicator brighter
- D. to avoid adding too much past the end point
Question 6
Titres (cm³): rough 24.2, run 1 23.15, run 2 23.2. Ignoring the rough titre, calculate the mean titre from the concordant results (within 0.10 cm³), in cm³. Give 2 decimal places.
Answercm³
Question 7
20 cm³ of 0.5 mol/dm³ sodium hydroxide is neutralised by 16 cm³ of hydrochloric acid. HCl + NaOH → NaCl + H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
Question 8
Which piece of equipment measures exactly 25.0 cm³ of alkali into the flask?
- A. a beaker
- B. a test tube
- C. a measuring cylinder
- D. a volumetric pipette
Question 9
Titres (cm³): rough 24.85, run 1 24.3, run 2 24.35. Ignoring the rough titre, calculate the mean titre from the concordant results (within 0.10 cm³), in cm³. Give 2 decimal places.
Answercm³
Question 10
25 cm³ of 0.5 mol/dm³ sodium hydroxide is neutralised by 22.5 cm³ of hydrochloric acid. HCl + NaOH → NaCl + H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
Question 11
Why is the conical flask swirled during a titration?
- A. to mix the solutions so the end point is seen accurately
- B. to change the indicator
- C. to speed up evaporation
- D. to cool the flask
Question 12
Titres (cm³): rough 23.42, run 1 22.32, run 2 22.27. Ignoring the rough titre, calculate the mean titre from the concordant results (within 0.10 cm³), in cm³. Give 2 decimal places.
Answercm³
Question 13
25 cm³ of 0.5 mol/dm³ sodium hydroxide is neutralised by 16 cm³ of sulfuric acid. H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
Question 14
Why is the conical flask swirled during a titration?
- A. to speed up evaporation
- B. to cool the flask
- C. to change the indicator
- D. to mix the solutions so the end point is seen accurately
Question 15
Titres (cm³): rough 22.95, run 1 22.4, run 2 22.45. Ignoring the rough titre, calculate the mean titre from the concordant results (within 0.10 cm³), in cm³. Give 2 decimal places.
Answercm³
Question 16
25 cm³ of 0.1 mol/dm³ sodium hydroxide is neutralised by 15 cm³ of hydrochloric acid. HCl + NaOH → NaCl + H₂O. What is the concentration of the acid, in mol/dm³? Give 3 decimal places.
Answermol/dm³
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