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Types of Chemical Reactions

Write down th...

Question

Write down the changes that will be seen in the instance and explain the reason behind it.
50 ml water is added to 50 ml solution of copper sulphate.

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Solution

A reversible reaction occurs and the colour change from pale blue to white and the change back to blue when water is added to Copper Sulphate

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Q. Write down the changes that will be seen in each instance and explain the reason behind it.
"Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH."

Write down the changes that will be seen in each instance and explain the reason behind it.

(a) 50ml water is added to 50ml solution of copper sulphate.

(b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide.

(c) Two or three filings of copper were added to 10ml dilute nitric acid and stirred.

(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.

(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.

(g) Dilute HCl was added to limestone.

(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

(i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.

Q. Write down the changes that will be seen in this instance and explain the reason behind it.
"A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred."

1.2475

g of crystalline copper sulphate was dissolved in water and excess of KI was added. The liberated iodine consumed

50

\frac{N}{10} N a_{2} S_{2} O_{3}

solution to reach the end point of the titration.The number of water molecules of hydration in crystalline copper sulphate salt is :

\frac{N}{10}

H C l

is required to neutralize 50 mL of sodium carbonate solution. What volume of water (in mL) must be added to a 30 mL

N a_{2} C O_{3}

solution so that the final solution has a concentration of

\frac{N}{50}

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