Answer:
Step-by-step explanation:
Hi
Step 1.. Explain the question
From the question,our aim is to know the litres of a 49% critic acid solution Georgina should add to 0.5 litres of water in order to make a 42% critic solution acid
Step 2.. Identify the given and missing variables
Here we not given the litres of a 49% critic solution to be added =?
We were given to critic acid solution to be made =42% which is our solute
Step 3 ...Representing the question in an equation format
Let the number of litres to be added be represented by y
Adding 0.5 litres of water will give y+0.5
Then we proceed
42/100 * (y+0.5) =49/100
0.42(y+0.5)=0.49
Expand the bracket
0.42y +0.21=0.49
0.42y=0.49-0.21
0.42y=0.28
Divide both sides by 0.42
y=3
