Which of the following is a buffer solution?
Show Hint
To solve the given problem, firstly, apply the basic concepts of buffer solution like characteristics and uses. Further, apply the concepts of preparation of buffer solution and find out which of the given options is correct.
- $ NaOH+NaCl $
- $ NaOH+N{{a}_{2}}C{{O}_{3}} $
- $ C{{H}_{3}}COOH+C{{H}_{3}}COONa $
- None of the above
The Correct Option is C
Solution and Explanation
Buffer solutions are aqueous solutions composed of a combination or a mixture of a neutral or a very weak acid and its conjugate base. The main purpose of a buffer solution is to resist the pH change. This way, if an acid or base is added into it, pH of the solution won't be affected. The acid or base applied is neutralized.
Among the four options; only option C contains acetic acid CH3COOH, a weak acid. The equation given in this option is a mixture of acetic acid, which is a weak acid, and sodium acetate CH3COONa, which is the salt of a weak acid.
Thus, Option C CH3COOH+CH3COONa is the correct answer.
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Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities.
Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by $H_2CO_3/HCO_3^-$ concentrations.
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Concepts Used:
Buffer solutions
The buffer solution is a solution that is able to maintain its Hydrogen ion concentration (pH) with only minor changes on the dilution or addition of a small amount of either acid or base. They are used in fermentation, food preservatives, drug delivery, printing, the activity of enzymes and many more.
Buffer solutions are aqueous solutions containing a weak acid and its salt - acid buffer or a weak base and its salt - base buffer.
Types of Buffer Solution
Acidic Buffers
These solutions are used to maintain acidic environments. Also, it has acidic pH and is prepared by mixing a weak acid and its salt with a strong base. An aqueous solution of an equal concentration of acetic acid and sodium acetate has a pH of 4.74.
Alkaline Buffers
These solutions are used to maintain basic conditions. It has a basic pH and is prepared by mixing a weak base and its salt with strong acid. The aqueous solution of an equal concentration of ammonium hydroxide and ammonium chloride has a pH of 9.25.
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