How much sodium bromide do I need to make 100 ml of 0.2m solution?
To calculate the amount of sodium bromide needed to make a 0.2m solution, we need to understand what the units "m" mean in this context.
In chemistry, "m" stands for "molar." A molar solution is a solution in which one mole of a substance is dissolved in one liter (1000 ml) of solvent.
To calculate the amount of sodium bromide needed, we can use the formula:
Amount of solute (in moles) = molarity * volume (in liters)
First, let's convert the given volume from milliliters to liters:
100 ml ÷ 1000 = 0.1 L
Next, we can substitute the known values into the formula:
Amount of solute (in moles) = 0.2 mol/L * 0.1 L
Now, multiply the molarity by the volume:
Amount of solute (in moles) = 0.02 moles
Finally, the amount of sodium bromide needed to make a 0.2m solution with a volume of 100 ml is 0.02 moles. To convert this into grams, you would need to know the molar mass of sodium bromide and use the formula:
Amount of solute (in grams) = moles * molar mass
However, since the molar mass of sodium bromide is not specified in the question, I am unable to provide the exact grams required.