Making Solutions (chemistry)

What type of instrument should you use to measure the water when making a stock solution?

• Graduated cylinder

• Beaker

• Volumetric flask

• Pipet

If you are making a dilution, the concentration shown on the stock solution can be described as the

• M1

• V1

• M2

• V2

If some of your solute gets stuck to the funnel, what should you use to move the solute into the volumetric flask?

• weigh boat

• wash bottle

• pipet

• spatula

How far should you fill a volumetric flask full of water?

• To the top

• To the calibration line

• To the bottom of the neck

• Half way

Reorder the following steps to making a solution into the correct order

• Add the solute to the volumetric flask using a funnel

• Fill the volumetric flask halfway with water

• Swirl the flask to dissolve the solute

• Use a wash bottle to fill the rest of the flask to the calibration line

• Measure out the mass of the solute in a weigh boat

If you fill your volumetric flask past the calibration line,

• Too bad, you have to make it over again.

• It's okay. Just add a little bit more solute

• It's okay. Just add a little more water

• Drop half of it down the drain and fill it back up to the calibration line

Which of the following formulas would you need to use to make a solution the way we did in lab?

• Molarity = moles of solute/liters of solution

• Percent composition = grams of solute/ grams of solution

• M1V1 = M2V2

You have been asked to prepare 500 mL of a 2.5 M solution of NaOH. How much NaOH should you measure out before adding water?

• 10g

• 100g

• 50g

• 80g

What does it mean to dilute a solution?

• lower the concentration of solute per solvent
• increase the concentration of solute per solvent

As we dilute a solution.....

• The volume increases and the molarity (M) increases

• The volume increases and the molarity (M) decreases

• The volume decreases and the molarity (M) increases

• The volume decreases and the molarity (M) decreases

Tags

NGSS.HS-PS1-5