Boiling removes Ca2+/Mg2+ in water, this reduces conductivity of particles.
Addition of washing soda, add Na+
ions in water therefore restoring the conductivity of particles.
john3 answered the question on November 5, 2017 at 06:21
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The melting point of phosphorous trichloride is -91°C while that of sodium chloride is 801°C. In terms of structure and bonding explain the difference in...
(Solved)
The melting point of phosphorous trichloride is -91°C while that of sodium chloride is 801°C. In terms of structure and bonding explain the difference in the melting point
Date posted:
November 5, 2017
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Answers (1)
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Describe how a solid sample of barium sulphate can be prepared starting with copper (II) oxide
(Solved)
Describe how a solid sample of barium sulphate can be prepared starting with copper (II) oxide
Date posted:
November 5, 2017
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Answers (1)
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Pure nitric (V) acid is colourless but the products in the laboratory preparation is usually yellow. Explain
(Solved)
Pure nitric (V) acid is colourless but the products in the laboratory preparation is usually yellow. Explain
Date posted:
November 5, 2017
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Answers (1)
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Nitric (V) acid may be prepared in the laboratory by the action of concentrated sulphuric (VI) acid on a suitable nitrate and distilling OFF the...
(Solved)
Nitric (V) acid may be prepared in the laboratory by the action of concentrated sulphuric (VI) acid on a suitable nitrate and distilling OFF the nitric (V) acid.
(a) Why is the apparatus consisting of glass desirable
Date posted:
November 5, 2017
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Answers (1)
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State two properties of copper that make it suitable for making ornaments
(Solved)
State two properties of copper that make it suitable for making ornaments
Date posted:
November 5, 2017
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Answers (1)
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A saturated solution of a salt Y at 300C weighing 76g yielded 34g of solid when evaporated to dryness. What is the solubility of the...
(Solved)
A saturated solution of a salt Y at 300C weighing 76g yielded 34g of solid when evaporated to dryness. What is the solubility of the salt at 300C
Date posted:
November 5, 2017
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Answers (1)
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Explain why the second ionization energy is higher than the first ionization energy
(Solved)
Explain why the second ionization energy is higher than the first ionization energy
Date posted:
November 5, 2017
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Answers (1)
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Define second ionisation energy
(Solved)
Define second ionisation energy
Date posted:
November 5, 2017
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Answers (1)
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Give one industrial use of chlorine gas
(Solved)
Give one industrial use of chlorine gas
Date posted:
November 5, 2017
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Answers (1)
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Apart from manganese (IV) oxide, give the formula of any two compound that can be used in the preparation of chlorine
(Solved)
Apart from manganese (IV) oxide, give the formula of any two compound that can be used in the preparation of chlorine
Date posted:
November 5, 2017
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Answers (1)
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A mixture contains ammonium chloride, silver chloride and lead (II) chloride. Describe how each of the substance can be obtained from the mixture
(Solved)
A mixture contains ammonium chloride, silver chloride and lead (II) chloride. Describe how each of the substance can be obtained from the mixture
Date posted:
November 5, 2017
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Answers (1)
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Name one reagent that can be used to distinguish between Al3+ and Zn2+ ions in solution and state what would be observed if each of...
(Solved)
Name one reagent that can be used to distinguish between Al3+ and Zn2+ ions in solution and state what would be observed if each of the ions is treated with the reagent you have named.
Date posted:
November 4, 2017
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Answers (1)
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Flower extracts are often used as indicators in the laboratory. State one disadvantage of using flower extracts as indicators
(Solved)
Flower extracts are often used as indicators in the laboratory. State one disadvantage of using flower extracts as indicators
Date posted:
November 4, 2017
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Answers (1)
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Explain the effect of the by-product of roasting process of zinc ores on the environment
(Solved)
Explain the effect of the by-product of roasting process of zinc ores on the environment
Date posted:
November 4, 2017
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Answers (1)
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Name the reducing agent used in the furnace during extraction of zinc
(Solved)
Name the reducing agent used in the furnace during extraction of zinc
Date posted:
November 4, 2017
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Answers (1)
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Zinc is extracted from calamine, name another ore used to extract zinc
(Solved)
Zinc is extracted from calamine, name another ore used to extract zinc
Date posted:
November 4, 2017
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Answers (1)
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State and explain the observation made when coloured flowers are placed into a gas jar full of chlorine gas
(Solved)
State and explain the observation made when coloured flowers are placed into a gas jar full of chlorine gas
Date posted:
November 4, 2017
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Answers (1)
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(a) During the extraction of Aluminium, the oxide of metal is dissolved in Molten cryolite before it is electrolysed. Explain. (b) Giving reasons, state two uses...
(Solved)
(a) During the extraction of Aluminium, the oxide of metal is dissolved in Molten cryolite before it is electrolysed. Explain.
(1mk)
(b) Giving reasons, state two uses of Aluminium metal
Date posted:
November 4, 2017
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Answers (1)
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Explain why Hydrogen Sulphide is a gas at room temperature while water is liquid at room temperature
(Solved)
Explain why Hydrogen Sulphide is a gas at room temperature while water is liquid at room temperature
Date posted:
November 4, 2017
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Answers (1)
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State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
(Solved)
State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
Date posted:
November 4, 2017
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Answers (1)