One litre of $0.15\, M\, Na _{2} SO _{3}$ aqueous solution is mixed with $500\, mL$ of $0.2\, M\, K _{2} Cr _{2} O _{7}$
aqueous solution in acid medium. What is the number of moles of $K _{2} Cr _{2} O _{7}$ remaining in the solution after the reaction?
- 0.1
- 0.0125
- 0.025
- 0.05
The Correct Option is D
Solution and Explanation
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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.