Answer
Verified
406.2k+ views
Hint: when an acid reacts with a base, neutralisation reaction takes place. This neutralisation reaction is accompanied by the formation of salt and water along with the evolution of heat which is called enthalpy of neutralisation.
Complete step by step solution:
Acetic acid is a carboxylic acid with a $ { pK }_{ a }$ of 4.75. From this value of $ { pK }_{ a }$ it is clear that acetic acid is a weak acid. Sodium hydrogen carbonate is a white solid and has a melting point of $50\quad ^{ o }{ C }$. Its ${ pK }_{ a1 }$ is 10.3 and its ${ pK }_{ a2 }$ is 6.4. It is amphoteric in nature and when dissolved in water, forms a weak alkaline solution.
When acetic acid is added to an aqueous solution of sodium bicarbonate, an acid-base reaction takes place (neutralisation reaction), which leads to the formation of a salt of sodium acetate and water along with the evolution of carbon dioxide. The salt sodium acetate has a tendency to undergo hydrolysis. Therefore on complete neutralisation, the pH of the solution is not neutral i.e. not 7 but rather greater than 7.
When carbon dioxide is evolved, it appears as a brisk effervescence. Carbon dioxide gas is colourless and odourless. It can be identified by passing it through lime water. If on passing a gas through lime water it turns milky, the gas is carbon dioxide gas. The reaction between acetic acid and sodium hydrogen carbonate/sodium bicarbonate is shown below:
$\begin{matrix} { CH }_{ 3 }COOH(aq) \\ Acetic\quad acid \end{matrix}+\begin{matrix} NaH{ CO }_{ 3 }(aq) \\ Sodium\quad bicarbonate \end{matrix}\rightarrow \begin{matrix} C{ H }_{ 3 }COONa(aq) \\ sodium\quad acetate \end{matrix}+\begin{matrix} { H }_{ 2 }O(l) \\ Water \end{matrix}+\begin{matrix} { CO }_{ 2 }(g)\uparrow \\ Carbon\quad dioxide \end{matrix}$
Hence the correct answer is (c) Bubbles of a colourless and odourless gas.
Note: When carbon dioxide is passed through lime water (aqueous solution of calcium hydroxide) it turns milky due to the formation of solid calcium carbonate which is white in colour and insoluble in water.
Complete step by step solution:
Acetic acid is a carboxylic acid with a $ { pK }_{ a }$ of 4.75. From this value of $ { pK }_{ a }$ it is clear that acetic acid is a weak acid. Sodium hydrogen carbonate is a white solid and has a melting point of $50\quad ^{ o }{ C }$. Its ${ pK }_{ a1 }$ is 10.3 and its ${ pK }_{ a2 }$ is 6.4. It is amphoteric in nature and when dissolved in water, forms a weak alkaline solution.
When acetic acid is added to an aqueous solution of sodium bicarbonate, an acid-base reaction takes place (neutralisation reaction), which leads to the formation of a salt of sodium acetate and water along with the evolution of carbon dioxide. The salt sodium acetate has a tendency to undergo hydrolysis. Therefore on complete neutralisation, the pH of the solution is not neutral i.e. not 7 but rather greater than 7.
When carbon dioxide is evolved, it appears as a brisk effervescence. Carbon dioxide gas is colourless and odourless. It can be identified by passing it through lime water. If on passing a gas through lime water it turns milky, the gas is carbon dioxide gas. The reaction between acetic acid and sodium hydrogen carbonate/sodium bicarbonate is shown below:
$\begin{matrix} { CH }_{ 3 }COOH(aq) \\ Acetic\quad acid \end{matrix}+\begin{matrix} NaH{ CO }_{ 3 }(aq) \\ Sodium\quad bicarbonate \end{matrix}\rightarrow \begin{matrix} C{ H }_{ 3 }COONa(aq) \\ sodium\quad acetate \end{matrix}+\begin{matrix} { H }_{ 2 }O(l) \\ Water \end{matrix}+\begin{matrix} { CO }_{ 2 }(g)\uparrow \\ Carbon\quad dioxide \end{matrix}$
Hence the correct answer is (c) Bubbles of a colourless and odourless gas.
Note: When carbon dioxide is passed through lime water (aqueous solution of calcium hydroxide) it turns milky due to the formation of solid calcium carbonate which is white in colour and insoluble in water.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Draw a diagram showing the external features of fish class 11 biology CBSE
Select the word that is correctly spelled a Twelveth class 10 english CBSE
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
What is BLO What is the full form of BLO class 8 social science CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Change the following sentences into negative and interrogative class 10 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths