Question

Determination of concentration of an acidic solution by ph metric titrations​

Answer 1

Answer:

pH is the measurement of the hydrogen ion concentration (that is the measure of the acidity of a solution). If the hydrogen ion concentration increase its means solution’s acidity also increases and pH value of the solution decreases.

Explanation:

1.​Obtain about 100 mL of 0.15 M HCl in a clean, dry beaker.  This beaker should be labeled.  Never pour any solution back into this beaker.  Once the solution has been poured into the buret, it should be discarded into the sink or waste container. 
2.​Rinse your buret with distilled water.  Then use a small amount of the 0.l5 M HCl solution to rinse the buret. (Pour about 10 ml of the HCl solution into the buret.  Let some of it flow through the tip.  Pour the rest of the HCl solution out the top of the buret, rotating the buret as you pour.)  The rinsing solution should be discarded into the sink.  Repeat this rinsing procedure twice more. Fill the buret to some point higher than the markings with the HCl solution and then carefully let the HCl solution out into a waste container until the bottom of the meniscus is on the 0.00 line.

3.​Obtain about 100 mL of NaOH solution in another clean, dry beaker.  This beaker should also be labeled.  Never pour any solution back into this beaker.  Once the solution has been poured into the buret, it should be discarded into the sink or waste container.  Rinse and fill the other buret as indicated in step 2. 
4.​Standardize the pH meter (Refer to the specific instructions for the pH meter that you will be using) 

5. Place a 250 mL beaker under the buret containing the 0.15 M HCl and let out approximately 20 mL into the beaker.  Record the mL of HCl added to the beaker. 

6.​Carefully drop a magnetic stirring bar into the beaker containing the HCl solution.  Set the beaker on the magnetic stirring motor and position the buret containing the NaOH solution and the pH electrode as shown in the diagram. Carefully turn on the stirring motor and make sure that the stirring bar does not hit the electrode.  Adjust the stirring speed as directed by your teacher. 
7.​Set up your data table to include mL of NaOH added and the pH of the solution.  You should allow for as many as 50 mL of solution. 

8.​Measure and record the pH of the solution before any NaOH has been added. 
9.​Add 1.0 mL of NaOH solution carefully from the buret.  Record the pH when it has stabilized.  Add another 1.0 mL of NaOH and record the pH. Continue adding NaOH in 1.0 mL increments until you have obtained a pH reading greater than 12.   

10.​Remove the pH electrode from the solution, rinse it with distilled water, and store it as directed by your teacher. 
11.​The solutions may be discarded down the sink.  Rinse the burets with distilled water and place it upside down in the buret holder to drain. 

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