Question

The volume of a drop of a liquid is 0.3 mL. When 30 drops of the liquid are drained, the level of the liquid in the burette is found to be 50 mL. What is the initial level of the liquid?

• A. 150ml
• B. 59ml
• C. 50ml
• D. 200ml

Answer 1

The correct option is B

59ml

STEP 1. GIVEN DATA:

The volume of a drop of a liquid =$0.3ml$

number of drops drained in the burette = $30$

the remaining liquid in the burette = $50ml$

STEP 2. CALCULATIONS:

Let the initial level of liquid = $X$

$amountofliquiddrained=noofdropsdrained\times volumeofeachdrop$

$amountofliquiddrained=30\times 0.3$

$amountofliquiddrained=9ml$

so from this,

$Initialvolumeofliquid=amountofliquiddrained+remainingliquidintheburette$

$X=9+50$

$X=59ml$

So, the initial volume of liquid = X = 59 ml. option B is correct