Payton carried out a titration experiment to determine the concentration of a sodium hydroxide solution using 0.1 moldm-3 HCl.
He placed 25.00cm3 of the sodium hydroxide solution in an Erlenmeyer flask with methyl orange indicator. He then put the HCl in a burette, releasing it slowly into the volumetric flask and recording the initial values and the final values after the methyl indicator turned red.
His data table is below.
Run
Volume in cm3
Initial value of burette
Final value of burette
Titre amount
Trial 1
0.00
23.85
______________
Trial 2
23.85
47.65
______________
Trial 3
0.00
23.80
______________
Calculate the concentration of the sodium hydroxide in g/dm3. Enter your answer rounded to a whole number without any units (e.g. 6.8 g/dm3 should be entered as 7)
Answer:
If you are stuck, here is a similar example.
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Question 2 of 5
2. Question
.
Somachi carried out a titration experiment to determine the concentration of an ethanoic acid, CH3COOH solution using 0.5 moldm-3 NaOH.
She placed 5.00cm3 of the ethanoic acid in an Erlenmeyer flask with phenolphthalein indicator and titrated this with the sodium hydroxide of known concentration.
Her data table is below.
Run
Volume in cm3
Initial value of burette
Final value of burette
Titre amount
Trial 1
0.20
8.59
______________
Trial 2
1.00
9.20
______________
Trial 3
1.01
9.20
______________
Calculate the concentration of the ethanoic acid solution in grams per dm3.
Enter your answer rounded to a whole number without any units (e.g. 6.8 g/dm3 should be entered as 7)
Answer:
HINT: The reaction equation is:
CH3COOH + NaOH → CH3COONa + H2O
Correct
Incorrect
Question 3 of 5
3. Question
.
Rubin carried out a titration experiment to determine the concentration of an NaOH solution using 1.5 moldm-3HCl.
He placed 10.00mL of HCl in an Erlenmeyer flask with phenolphthalein indicator and titrated this with the sodium hydroxide until the mixture turned pink.
His data table is below.
Run
Volume in cm3
Initial value of burette
Final value of burette
Titre amount
Trial 1
13.2
25.1
______________
Trial 2
25.1
36.6
______________
Trial 3
36.7
48.2
______________
Enter your answer rounded to a whole number without any units (e.g. 6.8 g/dm3 should be entered as 7)
Calculate the concentration of the sodium hydroxide solution in grams per dm3.
Answer:
Correct
Incorrect
Question 4 of 5
4. Question
.
Grace carried out a titration experiment to determine the concentration of an NaOH solution using 1.5 moldm-3 H2SO4.
She placed 10.00mL of H2SO4 in an Erlenmeyer flask with phenolphthalein indicator and titrated this with the sodium hydroxide until the mixture turned pink.
Her data table is below.
Run
Volume in cm3
Initial value of burette
Final value of burette
Titre amount
Trial 1
3.2
15.1
______________
Trial 2
15.1
26.6
______________
Trial 3
26.7
38.2
______________
Calculate the concentration of the sodium hydroxide in grams per dm3.
Enter your answer rounded to a whole number without any units (e.g. 6.8 g/dm3 should be entered as 7)
Answer:
Correct
Incorrect
Question 5 of 5
5. Question
.
Diplo dissolves 20 g of pure sodium hydroxide in 500cm3 of water. 25 cm3 of this solution was found on titration to completely neutralize 22.5 cm3 of a solution of sulfuric acid. Calculate the concentration of the acid solution. Use your periodic table for any molar masses.
Answer: [ a) 0.28 moles per dm3 || b) 0.140 moles per dm3 || c) 1.12 moles per dm3 || d) 0.56 moles per dm3 ]
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