If 250 ml of 0.25 M NaCl solution is diluted with water to a volume of 500 ml, the new concentration of solution is:

Explanation

To find the new concentration of the NaCl solution after dilution, we can use the dilution formula:

\[ M_1 V_1 = M_2 V_2 \]

Where:
- \( M_1 \) = initial molarity (concentration) of the solution
- \( V_1 \) = initial volume of the solution
- \( M_2 \) = final molarity (concentration) of the solution after dilution
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