You need to prepare 250.0 mL of HCl solution from a 4.00 M HCl stock solution. a

Question

You need to prepare 250.0 mL of HCl solution from a 4.00 M HCl stock solution. a 1.50 M Which type of glassware should you use to make the solution (assuming that the accuracy of the concentration is important)? O A O B O C 250 mL How should the correct amount of stock solution be obtained? 200 ml O Measure out x mL using a graduated cylinder. 250 mL 100 O Measure out x mL using a volumetric pipet. O Measure out x g on a balance. Based on your answer above, what is the value of x? Number How should the solution be mixed together? continued below... O Fill the container to the 250 mL mark then add the correct amount of stock solution. O Add the correct amount of stock solution then fill to the 250 mL mark with water. Fill the container halfway with water, add the correct amount of stock solution, then fill to the 250 mL mark with water. O None of these are the correct way to mix the stock solution. AG Previous Check Answer Next Exit

Explanation / Answer

1. A volumetric flask is more accurate for making solutions tahn a beaker or conical flask. So, C

2. Because it is a solution, it is worthy to measure out xmL using a volumetric pipet as pipet is more accurate than a cylinder.

3. Use eq M1V1 = M2V2

s, 1.5M x 250mL = 4M x V2

V2 = 93.75mL = x

4. beacuse HCl is an acid and acid is added to water to avoid explosion due to exothermic reaction, Fill the container halfway with water, add correct amount of stock solution, then fill to the 250mL mark with water.

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