Describe how you would obtain pure solid samples of each of the following components of a solid mixture containing ; Lead (II) chloride, Sodium carbonate and...

Describe how you would obtain pure solid samples of each of the following components of a
solid mixture containing ; Lead (II) chloride, Sodium carbonate and calcium sulphate.

---

- Mix With Cold Water, Sodium Carbonate Dissolves
- Filter off Lead (II) Chloride And Calcium sulphate as residue
- Evaporate to obtain sodium carbonate
- Mix the residue with hot water to dissolve Lead (II) chloride
- Filter off Calcium sulphate as a residue dry over dessicator
- Cool the filtrate to precipitate Lead (II) chloride
- Filter off residue as Lead (II chloride and dry

---

sharon kalunda answered the question on May 17, 2019 at 05:36

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• In an experiment,1g of calcium carbonate was completely dissolved 100cm³ of 0.25M excess hydrochloric acid.Calculate the molar concentration of the acidic solution formed. (Ca = 40;... (Solved)
  

  In an experiment,1g of calcium carbonate was completely dissolved 100cm³ of 0.25M excess hydrochloric acid.Calculate the molar concentration of the acidic solution formed. (Ca = 40; C = 12; O =16).

  Date posted: May 17, 2019 .    Answers (1)

• A hydrocarbon has an empirical formula C₂H₃and a relative molecular mass of 54. (Solved)
  

  A hydrocarbon has an empirical formula C₂H₃and a relative molecular mass of 54.
  a) Determine the molecular formula of the hydrocarbon ( C=12; H=1)
  b) Name the homologous series to which the hydrocarbon belongs. Give a reason for your answer.
  c) When one mole of the hydrocarbon reacts with one mole of hydrogen chloride gas,
  compound W is formed. Give the IUPAC systematic name of W.

  Date posted: May 16, 2019 .    Answers (1)

• Explain the meanings of the following physical properties of laboratory gases. (Solved)
  

  Explain the meanings of the following physical properties of laboratory gases.
  i) A chocking smell.
  ii) An irritating smell.
  iii) A neutral gas

  Date posted: May 16, 2019 .    Answers (1)

• An element X has atomic number 3, relative atomic mass 6.94 and consists of two isotopes of mass numbers 6 and 7. (Solved)
  

  An element X has atomic number 3, relative atomic mass 6.94 and consists of two isotopes
  of mass numbers 6 and 7.
  a) What is the mass number of the more abundant isotope of X?
  b) Calculate the relative abundance of each of the isotopes.

  Date posted: May 16, 2019 .    Answers (1)

• When burning magnesium ribbon is put into a gas jar of carbon (IV) oxide gas, it continues to burn leaving behind white solid powder and black... (Solved)
  

  When burning magnesium ribbon is put into a gas jar of carbon (IV) oxide gas, it continues to
  burn leaving behind white solid powder and black solid specks as residue write chemical
  equation for the reaction that produces.
  i) The white solid powder.
  ii) Black solid specks.

  Date posted: May 16, 2019 .    Answers (1)

• State two large scale uses of hard water. (Solved)
  

  State two large scale uses of hard water.

  Date posted: May 16, 2019 .    Answers (1)

• Explain how dilute hydrochloric acid can be used to determine the type of hardness in a sample of tap water. (Solved)
  

  Explain how dilute hydrochloric acid can be used to determine the type of hardness in a sample of tap water.

  Date posted: May 16, 2019 .    Answers (1)

• Describe hardness of water. (Solved)
  

  Describe hardness of water.

  Date posted: May 16, 2019 .    Answers (1)

• A factory produces 63.6 tonnes of anhydrous Na₂CO₃ on a certain. Calculate the number of tonnes of sodium chloride used on this particular day. Assume... (Solved)
  

  A factory produces 63.6 tonnes of anhydrous Na₂CO₃ on a certain. Calculate the number of tonnes of sodium chloride used on this particular day. Assume the plant is working at 100% efficiency.(C = 12, H = 1, Cl = 35.5, Ca = 40, Na = 23)

  Date posted: May 16, 2019 .    Answers (1)

• The flow chart below shows the manufacture of sodium carbonate. Study it carefully and answer the questions that follow. (Solved)
  

  The flow chart below shows the manufacture of sodium carbonate. Study it carefully and
  answer the questions that follow.
  
  a)
  i). What is ammoniacal brine?
  ii). Ammoniacal brine reacts with carbon (IV) oxide to form a mixture of two salts
  which produce Q. Write an equation to show formation of Q
  Name two processes that are used to separate Q into NH₄Cl and P
  b) Give two uses of sodium carbonate produced in the process.
  c)i). Name the substance that reacts with water that comes into the slaker
  ii). What happens at the kiln?
  d) Write an equation for the reaction that occurs when P is heated to form solid
  Na₂ CO₃
  e) Name two substances that are recycled in the process.

  Date posted: May 16, 2019 .    Answers (1)

• Define the term molar heat of displacement (Solved)
  

  Define the term molar heat of displacement

  Date posted: May 16, 2019 .    Answers (1)

• 0.65 of zinc was reacted with 20cm³ of 2 M copper(II) sulphate solution in a plastic beaker. The copper(II) sulphate solution was in excess. The initial... (Solved)
  

  0.65 of zinc was reacted with 20cm³ of 2 M copper(II) sulphate solution in a plastic beaker.
  The copper(II) sulphate solution was in excess. The initial temperature and the highest temperature of the solution were recorded. 0.64 of copper metal was formed.
  a) Other than change in temperature, state the observations made during the reaction
  b) Calculate the
  I Number of moles of Zinc that reacted (Zn=65)
  II The number of moles of copper that was displaced from the solution (Cu=64)
  III The mole ratio of Zn: Cu
  

  Date posted: May 16, 2019 .    Answers (1)

• The grid below represents part of the periodic table. The letters do not represent the actual symbols of the elements. Study it and answer the questions... (Solved)
  

  The grid below represents part of the periodic table. The letters do not represent the actual
  symbols of the elements. Study it and answer the questions that follow.
  
  a) Explain why element A is placed in two positions in the periodic table.
  b) Name the type of bond and structure formed when element F reacts with element G.
  c) Select one element which forms a highly soluble carbonate.
  d) Which name is given to the group to which element D belong?.
  e) Compare and explain the following:
  i). Atomic radii of elements B and E.
  ii). Electrical conductivity of elements E and H.
  f)i). The oxide of element C was dissolved in water to form a solution of C. Compare the pH
  value of the solution C with that of sodium chloride solution. Give a reason for your answer.
  ii). Give ONE use of elements of which J is a member.

  Date posted: May 16, 2019 .    Answers (1)

• State one use of radioactive isotope in (i). Medicine (ii). Industry. (Solved)
  

  State one use of radioactive isotope in
  i). Medicine
  ii). Industry.

  Date posted: May 16, 2019 .    Answers (1)

• Radioactive carbon – 14 decays by emitting ß- Particle to form N-14. Write a nuclear equation for the reaction. (Solved)
  

  Radioactive carbon – 14 decays by emitting β- Particle to form N-14. Write a nuclear
  equation for the reaction.

  Date posted: May 16, 2019 .    Answers (1)

• Distinguish between nuclear fission and nuclear fusion. (Solved)
  

  Distinguish between nuclear fission and nuclear fusion.

  Date posted: May 16, 2019 .    Answers (1)

• The table below gives the percentage of a radioactive isotope of Bismuth that remains after decaying at different times. (Solved)
  

  The table below gives the percentage of a radioactive isotope of Bismuth that remains after
  decaying at different times.
  
  i). On the grid provided, plot a graph of the percentage of Bismuth remaining(Vertical axis) against
  time.
  ii) Using the graph determine the
  i) Half- life of Bismuth isotope.
  ii) Original mass of the Bismuth Isotope given that the mass that remained after 70
  minutes was 0.16g.

  Date posted: May 16, 2019 .    Answers (1)

• Study the flow chart below and use it to answer the questions between. (Solved)
  

  Study the flow chart below and use it to answer the questions between.
  
  a) Identify the process described by the flow chart
  b) Explain why the Ore is crushed
  c) Which process occurs at mixing chamber?
  d) Explain the use of ;
  i) water
  ii) Oil
  e) Compressed air Write down an equation for the formation of slag.
  f) Identify the cations present where the metal is being purified.
  

  Date posted: May 16, 2019 .    Answers (1)

• The set – up below was used during the electrolysis of a solution of magnesium sulphate using inert electrodes. (Solved)
  

  The set – up below was used during the electrolysis of a solution of magnesium
  sulphate using inert electrodes.
  
  i). Identify the ions present in the electrolyte
  ii). Write half equations at the anode and at the cathode:
  Cathode:
  Anode

  Date posted: May 16, 2019 .    Answers (1)

• Study the following table and then use it to answer the questions that follow (Solved)
  

  Study the following table and then use it to answer the questions that follow
  
  These organic compounds belong to the same homologous series.
  i). What is meant by the term homologous series?
  ii). To which homologous series do the above hydrocarbons belong?
  iii). Select one hydrocarbon that would be a liquid at room temperature 298K. Give a reason for your answer
  iv). What is the relationship between the boiling point and the relative molecular masses of
  the hydrocarbons in the table above? Explain your answer
  v). Give one chemical test to distinguish between C₂H₆ and the third member to the homologous series of the general formula C_nH₂n.

  Date posted: May 16, 2019 .    Answers (1)