
We are given:
Total solution = 8 litres
Acid concentration = 20%
We are to find: how many litres of pure acid are present in this solution.
🧠 Concept:
To find the amount of pure acid in a solution:
Pure acid=Percentage strength×Total volume\text{Pure acid} = \text{Percentage strength} \times \text{Total volume}
🔢 Step-by-step Calculation:
Pure acid=20100×8=0.2×8=1.6 litres\text{Pure acid} = \frac{20}{100} × 8 = 0.2 × 8 = 1.6 \text{ litres}
✅ Final Answer:
There are 1.6 litres of pure acid in 8 litres of a 20% solution.