From the list below, list the steps required to complete a titration in a correct order.The concentration of a solution of sodium hydroxide was found by titration with a standard solution of...
From the list below, list the steps required to complete a titration in a correct order.
The concentration of a solution of sodium hydroxide was found by titration with a standard solution of hydrochloric acid. The following steps (not in the correct order) were used when carrying out the titration:
I - The burette was filled with hydrochloric acid.
II - The conical flask was rinsed with water.
III - The burette was rinsed with hydrochloric acid.
IV - An aliquot of sodium hydroxide was placed in the conical flask.
V - The level of acid in the burette was read.
VI - The level of acid in the burette was read.
VII - A pipette was rinsed with sodium hydroxide solution.
VIII - Hydrochloric acid was discharged from the burette until the end point was reached.
IX - An indicator was added to the sodium hydroxide solution.
The first step should be to make sure the burette and the conical flask are clean of impurities, so I would select steps 3 and 2. Step 7, cleansing of the pipette, which will add the indicator, should occur next. After that, step 4, an aliquot of sodium hydroxide is placed into the conical flask, then step 9, add the indicator to the sodium hydroxide using the pipette. Next, step 1, fill the burette with hydrochloric acid, preferably to the zero mark. Now to do the titration, which would be step 8, discharging hydrochloric acid from the burette until titration was reached. That leaves the last step, which is listed twice as step 5 and step 6, read the level of acid in the burette.
So, correct order would be as follows: 3,2,7,4,9,1,8, then 5 or 6.