Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

25.0cm³ of a mixture of Fe²⁺ and Fe³⁺ ions in an aqueous salt was acidified with sulphuric(VI)acid then titrated against potassium manganate(VI).The salt required 15cm³...

25.0cm³ of a mixture of Fe²⁺ and Fe³⁺ ions in an aqueous salt was acidified with sulphuric(VI)acid then titrated against potassium manganate(VI).The salt required 15cm³ of 0.02M potassium manganate(VI) for complete reaction.
A second 25cm³ portion of the Fe²⁺ and Fe³⁺ ion salt was reduced by Zinc then titrated against the same concentration of potassium manganate(VI).19.0cm³ of potassium manganate(VI)solution was used for complete reaction. Calculate the concentration of Fe²⁺ and Fe³⁺ ion in the solution on moles per litre.

Answers

Wilfykil answered the question on February 18, 2019 at 06:13

Answer Attachments

Next: 46.0g of a metal carbonate MCO3 was dissolved 160cm³ of 0.1M excess hydrochloric acid and the resultant solution diluted to one litre.25.0cm³ of this solution...

Previous: 9.7 g of a mixture of Potassium hydroxide and Potassium chloride was dissolved to make one litre solution.20.0cm³ of this solution required 25.0cm³ of 0.12M...

View more Chemistry Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

46.0g of a metal carbonate MCO3 was dissolved 160cm³ of 0.1M excess hydrochloric acid and the resultant solution diluted to one litre.25.0cm³ of this solution... (Solved)

46.0g of a metal carbonate MCO3 was dissolved 160cm³ of 0.1M excess hydrochloric acid and the resultant solution diluted to one litre.25.0cm³ of this solution required 20.0cm³ of 0.1M sodium hydroxide solution for
complete neutralization. Calculate the atomic mass of "M"

Date posted: February 18, 2019 . Answers (1)
A certain carbonate, GCO3, reacts with dilute hydrochloric acid according to the equation given below If 1 g of the carbonate reacts completely with 20 cm³... (Solved)

A certain carbonate, GCO3, reacts with dilute hydrochloric acid according to the equation given below

If 1 g of the carbonate reacts completely with 20 cm³ of 1 M hydrochloric acid ,calculate the relative atomic mass of G (C = 12.0 = 16.0)

Date posted: February 18, 2019 . Answers (1)
20.0cm³ of 0.05 M acidified potassium manganate(VII)solution oxidized 25.0cm³ of Fe²⁺(aq) ions in 40.0g/l of impure Iron (II)sulphate(VI) to Fe³⁺(aq) ions. Calculate the percentage impurities... (Solved)

20.0cm³ of 0.05 M acidified potassium manganate(VII)solution oxidized 25.0cm³ of Fe²⁺(aq) ions in 40.0g/l of impure Iron (II)sulphate(VI) to Fe³⁺(aq) ions. Calculate the percentage impurities in the Iron (II)sulphate(VI).

Date posted: February 18, 2019 . Answers (1)
You are provided with: (i)sodium L containing 5.0g per litre of a dibasic organic acid H2X.2H2O. (ii)solution M which is acidified potassium manganate(VII) (iii)solution N a mixture of... (Solved)

You are provided with:
(i)sodium L containing 5.0g per litre of a dibasic organic acid H2X.2H2O.
(ii)solution M which is acidified potassium manganate(VII)
(iii)solution N a mixture of sodium ethanedioate and ethanedioic acid
(iv) 0.1M sodium hydroxide solution P
(v) 1.0M sulphuric(VI)
You are required to:
(i)standardize solution M using solution L
(ii)use standardized solution M and solution P to determine the % of sodium ethanedioate in the mixture

Date posted: February 18, 2019 . Answers (1)
You are provided with: (i)an impure calcium carbonate labeled M (ii)Hydrochloric acid labeled solution N (iii)solution L containing 20g per litre sodium hydroxide (Solved)

You are provided with:
(i)an impure calcium carbonate labeled M
(ii)Hydrochloric acid labeled solution N
(iii)solution L containing 20g per litre sodium hydroxide
You are required to determine the concentration of N in moles per litre and the % of calcium carbonate in mixture M.

Date posted: February 18, 2019 . Answers (1)
You are provided with: Acidified Potassium Manganate (VII) solution A, 0.1M of an iron (II) salt solution B.... (Solved)

You are provided with:

Date posted: February 15, 2019 . Answers (1)
Calculate the molarity of a solution containing 4.0 g sodium hydroxide dissolved in 500 cm³ solution (Solved)

Calculate the molarity of a solution containing 4.0 g sodium hydroxide dissolved in 500 cm³ solution

Date posted: February 15, 2019 . Answers (1)
100 cm³ of nitrogen (II)oxide NO combine with 50 cm³ of Oxygen to form 100 cm³ of a single gaseous compound of nitrogen. All volumes... (Solved)

100 cm³ of nitrogen (II)oxide NO combine with 50 cm³ of Oxygen to form 100 cm³ of a single gaseous compound of nitrogen. All volumes measured at the same temperature and pressure. Obtain the equation for the reaction and name the gaseous product

Date posted: February 15, 2019 . Answers (1)
1.0g of an alloy of aluminium and copper were reacted with excess hydrochloric acid. If 840 cm³ of hydrogen at s.t.p was produced, calculate the... (Solved)

1.0g of an alloy of aluminium and copper were reacted with excess hydrochloric acid. If 840 cm³ of hydrogen at s.t.p was produced, calculate the % of copper in the alloy.(Al =27.0,one mole of a gas at s.t.p =22.4 dm³ )

Date posted: February 15, 2019 . Answers (1)
Calculate the volume of carbon(IV)oxide at r.t.p produced when 5.0 g of calcium carbonate is strongly heated.(Ca=40.0, C= 12.0,O = 16.0,1 mole of gas =22.4... (Solved)

Calculate the volume of carbon(IV)oxide at r.t.p produced when 5.0 g of calcium carbonate is strongly heated.(Ca=40.0, C= 12.0,O = 16.0,1 mole of gas =22.4 at r.t.p)

Date posted: February 15, 2019 . Answers (1)
Calculate the number of particles present in 0.135 g of a gaseous hydrocarbon X on complete combustion produces 0.41g of carbon(IV)oxide and 0.209g of water.0.29g... (Solved)

Calculate the number of particles present in 0.135 g of a gaseous hydrocarbon X on complete combustion produces 0.41g of carbon(IV)oxide and 0.209g of water.0.29g of X occupy 120cm3 at room temperature and 1 atmosphere pressure .Name X and draw its molecular structure.(C=12.0,O= 16.O,H=1.0,1 mole of gas occupies 24dm3 at r.t.p)

Date posted: February 15, 2019 . Answers (1)
A compound of carbon, hydrogen and oxygen contain 54.55% carbon, 9.09% and remaining 36.36% oxygen. If its relative molecular mass is 88, determine its molecular formula(C=12.0,... (Solved)

A compound of carbon, hydrogen and oxygen contain 54.55% carbon, 9.09% and remaining 36.36% oxygen.
If its relative molecular mass is 88, determine its molecular formula(C=12.0, H =1.0, O= 16.0)

Date posted: February 15, 2019 . Answers (1)
A hydrocarbon was found to contain 92.3% carbon and the remaining Hydrogen. If the molecular mass of the compound is 78, determine the molecular formula(C=12.0,... (Solved)

A hydrocarbon was found to contain 92.3% carbon and the remaining Hydrogen. If the molecular mass of the compound is 78, determine the molecular formula(C=12.0, H =1.0)

Date posted: February 15, 2019 . Answers (1)
1.60g of an oxide of Magnesium contain 0.84g by mass of Magnesium. Determine its empirical formula(Mg = 24.0, 16.0) (Solved)

1.60g of an oxide of Magnesium contain 0.84g by mass of Magnesium.
Determine its empirical formula(Mg = 24.0, 16.0)

Date posted: February 15, 2019 . Answers (1)
Calculate the mass of Oxygen used to react with copper (Solved)

Calculate the mass of Oxygen used to react with copper

Date posted: February 15, 2019 . Answers (1)
25 cm³ of carbon(II)oxide diffuses across a porous plate in 25 seconds. How long will it take 75 cm³ of Carbon(IV)oxide to diffuse across the... (Solved)

25 cm³ of carbon(II)oxide diffuses across a porous plate in 25 seconds. How long will it take 75 cm³ of Carbon(IV)oxide to diffuse across the same plate under the same conditions of temperature and pressure. (C=12.0,0=16.0)

Date posted: February 15, 2019 . Answers (1)
How long would 200 cm3 of Hydrogen chloride take to diffuse through a porous plug if carbon(IV)oxide takes 200 seconds to diffuse through? (Solved)

How long would 200 cm3 of Hydrogen chloride take to diffuse through a porous plug if carbon(IV)oxide takes 200 seconds to diffuse through?

Date posted: February 15, 2019 . Answers (1)
How does the use of manganese (IV) oxide in the laboratory preparation of chlorine gas differ from its use in the laboratory preparation of hydrogen... (Solved)

How does the use of manganese (IV) oxide in the laboratory preparation of chlorine gas differ from its use in the laboratory preparation of hydrogen gas?

Date posted: February 13, 2019 . Answers (1)
An element Q reacts with dilute acids but not with cold water. Element R does not react with dilute acids.Element S displaces element P from... (Solved)

An element Q reacts with dilute acids but not with cold water. Element R does not react with dilute acids. Element S displaces element P from its oxides. P reacts with cold water. Arrange the four metals in order of their reactivity starting with the most reactive.

Date posted: February 13, 2019 . Answers (1)
Give three uses of copper metal. (Solved)

Give three uses of copper metal.

Date posted: February 13, 2019 . Answers (1)