Determine the Final Concentration of 30 ml of 5 M NaCl Solution After 20 ml of Water Has Been Added

To find the final concentration after diluting the NaCl solution, we can use the formula for dilution, which is:

C₁V₁ = C₂V₂

Where:

• C₁ = initial concentration (5 M)
• V₁ = initial volume (30 ml)
• C₂ = final concentration (unknown)
• V₂ = final volume (30 ml + 20 ml = 50 ml)

Now we can plug in the values:

5 M × 30 ml = C₂ × 50 ml

Calculating the left side:

150 = C₂ × 50

Now, solve for C₂:

C₂ = 150 / 50

C₂ = 3 M

The final concentration of the NaCl solution after adding 20 ml of water is 3 M.