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Choose the most appropriate answer amongst the options given below for the statement. A solution of a desired concentration is prepared by diluting
- a)solution of known higher concentration
- b)solution of known lower concentration
- c)from a serially diluted solution
- d)stock solution.
Correct answer is option 'D'. Can you explain this answer?
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Preparing Stock Solutions
A stock solution is prepared by weighing out an appropriate portion of a pure solid or by measuring out an appropriate volume of a pure liquid and diluting to a known volume. Exactly how this is done depends on the required concentration unit. For example, to prepare a solution with a desired molarity you weigh out an appropriate mass of the reagent, dissolve it in a portion of solvent, and bring to the desired volume. To prepare a solution where the solute’s concentration is a volume percent, you measure out an appropriate volume of solute and add sufficient solvent to obtain the desired total volume.
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Explanation:
Stock Solution:
- Stock solution is a solution with a known concentration and is typically more concentrated than the desired final concentration.
- It serves as the source from which solutions of lower concentrations can be prepared.
Dilution Process:
- To prepare a solution of desired concentration, a stock solution is diluted with a suitable solvent (usually water or buffer solution).
- The concentration of the final solution is calculated using the formula: C1V1 = C2V2, where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the concentration and volume of the final solution.
Why Stock Solution is Chosen:
- Using a stock solution ensures accuracy and consistency in preparing solutions of desired concentrations.
- It also saves time and resources as it eliminates the need to prepare solutions from scratch each time.
Advantages of Using Stock Solution:
- Stock solutions are stable and can be stored for longer periods.
- They are convenient for repeated use in experiments without the need for frequent preparation.
Therefore, the most appropriate answer is option 'D' - stock solution, as it is the common practice to prepare solutions of desired concentrations by diluting a stock solution.
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Choose the most appropriate answer amongst the options given below for the statement. A solution of a desired concentration is prepared by dilutinga)solution of known higher concentrationb)solution of known lower concentrationc)from a serially diluted solutiond)stock solution.Correct answer is option 'D'. Can you explain this answer?
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