6. a) Using Brine solution how will you prepare caustic soda, baking soda and washing soda.
Give two uses each for all the three salts formed.
b) A road tanker carrying an acid was involved in an accident and its contents spilled on
the road. At the side of the road, iron drain covers began melting and fizzing as the
acid ran over them. A specialist was called to see if the acid actually leaked into the
nearby river and soil.
i) Explain how the specialist could carry out a simple test to see if the river water
contains acid or not and how it neutralises acidic soil.
ii) The word 'melting' is incorrectly used in report. Suggest a better name that should
have been used.
iii) Explain why the drain covers began fizzing as the acid ran over them.
Answers
Answer: Here is your answer .
Explanation:a) 1)NaCl + H2O => NaOH + HCl
2) NaCl + H2O + CO2 +NH3 => NaHCO3 + NH4CL
3) 2NaHCO3 => Na2CO3 + H2O + CO2
Uses :> 1.Baking soda is used in cooking .
2. Washing soda is used in washing purpose.
3. Both are used in chemical industry.
4. Every soda is used in making Soda fire extinguishers.
b) i) The scientist used litmus paper to test the river water and to neutralise the acidic effect they used any antacid like baking soda , washing soda, etc.
ii) Effervsence
iii) This is because there is a realisation of CO2 gas.
Answer:
(a) By dipping a strip of blue litmus paper in to the sample of river water.
If the colour changes to red this means that some acid has gone in to the river.
(b) Corrosion.
(c) Iron reacts with acid to evolve hydrogen gas.