Solution Concentration Calculation:

To calculate the concentration of the solution, we need to determine the amount of alcohol in the solution and express it as a percentage or ratio. The concentration of a solution is typically expressed as the amount of solute (in this case, alcohol) per unit volume of the solution.

Step 1: Calculate the total volume of the solution:
The total volume of the solution is the sum of the volumes of alcohol and water in the mixture. In this case, the volume of alcohol is 5.6 ml and the volume of water is 76 ml. Therefore, the total volume of the solution is:

Total volume = Volume of alcohol + Volume of water
Total volume = 5.6 ml + 76 ml
Total volume = 81.6 ml

Step 2: Calculate the concentration of alcohol:
To calculate the concentration of alcohol, we divide the volume of alcohol by the total volume of the solution and multiply by 100 to express it as a percentage.

Concentration of alcohol = (Volume of alcohol / Total volume of the solution) * 100

Substituting the values:

Concentration of alcohol = (5.6 ml / 81.6 ml) * 100
Concentration of alcohol = 0.0686 * 100
Concentration of alcohol = 6.86%

Therefore, the concentration of the solution is 6.86%.

Summary:
The concentration of the solution is determined by dividing the volume of alcohol by the total volume of the solution and expressing it as a percentage. In this case, a solution contains 5.6 ml of alcohol and 76 ml of water, giving a total volume of 81.6 ml. The concentration of alcohol in the solution is calculated as (5.6 ml / 81.6 ml) * 100, which equals 6.86%.