20 note that the metal in the above reactions

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Macroscale and Microscale Organic Experiments
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Chapter CATP / Exercise 7
Macroscale and Microscale Organic Experiments
Williamson/Masters
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20Note that the metal in the above reactions displaces hydrogen atomsfrom the acids as hydrogen gas and forms a compound called a salt.Thus, the reaction of a metal with an acid can be summarised as –Acid + Metal Salt + Hydrogen gasCan you now write the equations for the reactions you have observed?Activity 2.4Activity 2.4Activity 2.4Activity 2.4Activity 2.4The reactions occurring in the above Activity are written as –Test tube A: Na COHCl(aq)Cl(aq)H O(l) + CO2322(s)Na(g)++22Test tube B: NaHCOHCl(aq)Cl(aq)H O(l) + CO322(s)Na(g)++On passing the carbon dioxide gas evolved through lime water,Ca(OH)COH O(l)222(aq)(g)CaCO s3++( )(Lime water)(White precipitate)square6Place a few pieces of granulated zinc metal in a test tube.square6Add 2 mL of sodium hydroxide solution and warm the contentsof the test tube.square6Repeat the rest of the steps as in Activity 2.3 and record yourobservations.The reaction that takes place can be written as follows.2NaOH(aq) + Zn(s) Na2ZnO2(s) + H2(g)(Sodium zincate)You find again that hydrogen is formed in the reaction. However,such reactions are not possible with all metals.2.1.3 How do Metal Carbonates and MetalHydrogencarbonates React with Acids?Activity 2.5Activity 2.5Activity 2.5Activity 2.5Activity 2.5square6Take two test tubes, label them as Aand B.square6Take about 0.5 g of sodium carbonate(Na2CO3) in test tube A and about0.5 g of sodium hydrogencarbonate(NaHCO3) in test tube B.square6Add about 2 mL of dilute HCl to boththe test tubes.square6What do you observe?square6Pass the gas produced in each casethrough lime water (calciumhydroxide solution) as shown inFig. 2.2 and record your observations.Figure 2.2Figure 2.2Figure 2.2Figure 2.2Figure 2.2Passing carbon dioxide gasthrough calcium hydroxidesolution2018-19
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Macroscale and Microscale Organic Experiments
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Chapter CATP / Exercise 7
Macroscale and Microscale Organic Experiments
Williamson/Masters
Expert Verified
Acids, Bases and Salts21Activity 2.6Activity 2.6Activity 2.6Activity 2.6Activity 2.6square6Take about 2 mL of dilute NaOH solution in a test tube and addtwo drops of phenolphthalein solution.square6What is the colour of the solution?square6Add dilute HCl solution to the above solution drop by drop.square6Is there any colour change for the reaction mixture?square6Why did the colour of phenolphthalein change after the additionof an acid?square6Now add a few drops of NaOH to the above mixture.square6Does the pink colour of phenolphthalein reappear?
Why do you think this has happened?
2
In the above Activity, we have observed that the effect of a base isnullified by an acid and vice-versa. The reaction taking place is written as –NaOH(aq) + HCl(aq) NaCl(aq) + H2O(l)The reaction between an acid and a base to give a salt and water isknown as a neutralisation reaction. In general, a neutralisation reactioncan be written as –Base + Acid Salt + Water

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