Look at Figure 4.1 and answer the following questions
(a) What change would you observe in the calcium hydroxide solution taken in tube B?
(b) Write the reaction involved in test tubes A and B respectively.
(c) If ethanol is given instead of ethanoic acid
(a) The changes observed in B is that Calcium Hydroxide solution would become milky.
(b) Reaction in Tube A:
$CH_3COOH+NaHCO_3 → CH_3COONa + CO_2 + H_2O$
Reaction in tube B
$Ca(OH)_2 + CO_2 → CaCO_3 + H_2O$
(c) If ethanol is replaced with ethanoic acid, the same change will not be observed as Ethanol will not react with Sodium Hydrogen carbonate.
(d) A solution of lime water can be prepared in the laboratory by taking distilled water in a beaker and mixing Calcium carbonate powder to it, thoroughly. Allow the solution to settle and decant the clear solution to obtain the lime water.
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- (a) What happens when ethanol reacts with ethanoic acid in the presence of a little of concentrated sulphuric acid? Write equation of the reaction involved.(b) What happens when ethanol is heated with concentrated sulphuric acid at 170°C? Write the equation of the reaction which takes place.
- You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put(a) a piece of blue litmus paper in each test tube(b) a piece of red litmus paper in each test tube(c) a few drops of phenolphthalein solution to each test tube?
- Look at figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help
- Write the formulae of: (a) methanoic acid, and (b) ethanoic acid.
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- Lead nitrate solution is added to a test tube containing potassium iodide solution.(a) Write the name and colour of the compound precipitated.(b) Write the balanced chemical equation for the reaction involved.(c) Name the type of this reaction justifying your answer.
- 2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3: 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could beAlAuCuPt
- Blue litmus solution is added to two test tubes A and B containing dilute HC1 and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
- How would you convert:(a) ethanol into ethene? (b) propanol into propanoic acid? Name the process in each case and write the equations of the reactions involved.
- What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
- Take three test tubes. Fill 3/4th of each with water. Label them A, B, and C. Keep a snail in test tube A, a water plant in test tube B, and in C, keep the snail and plant both. Which test tube would have the highest concentration of CO2?
- Take three test-tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
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