Question

What volume in mL of 0.220M HBr solution is required to produce 0.0185 moles of HBr ?

Answer 1

84.1 mL

Step-by-step explanation:

Molarity is the most common measure of concentration.

Defining Molarity

Molarity is a measurement of concentration. This means that molarity describes how many moles of solute are in a specific volume. Molarity is moles of solute divided by liters of solution. Molarity is given in molar units, which is shortened to M. Specifically, molarity is extremely useful in titrations and stoichiometry.

Finding Milliliters

In order to find the volume needed, we can set up an equation. Remember that molarity is given in liters, not milliliters.

• 
  `(0.0185 \rm mol)/(x\ \rm L) =0.220 \ \rm M`

Now, we can solve for x.

• x = 0.0841

I rounded to 3 significant figures because both 0.220 and 0.0185 have 3 sig figs. So, now we know the number of liters, but we still need to solve for milliliters. To convert from liters to milliliters, multiply by 1000.

• 0.0841 * 1000 = 84.1

So, 84.1 mL of 0.220M HBr is required to produce 0.0185 moles of HBr.