2A assignment
Undertake titration and colorimetry to determine the concentration of
solutions.
In these experiments firstly I learned the risk that I might have to face in the lab and
precautions to eliminate any dangers that occurs. Then, I have developed the skills to make
and use different solutions like hydrochloric acid, sodium hydrogen sulphate and copper
sulphate. In addition of calibration I learned how to handle with different equipment.
According to the results of titration and colorimetry I learned how to find moles and
concentrations of different unknown solutions using graphs and algebraic calculations.
Calibration is a process of figuring out a measuring instrument to get the results of the
sample in more accurate and acceptable range. For example, in my experiments I calibrated
pH meter, digital balance and a volumetric glassware.
To calibrate pH meter,
First, I rinse it with distilled water.
Then on my pH meter it says 4 pH that is mean I have to put the pH robe into the
acidic solution or solution with 4 ph.
Wait until the pH reading gets stabilized.
Rinse it with distilled water again.
Then on the meter it says 7 pH that mean I have to put the pH robe into the
neutralized solution or solution with 7 ph.
Wait until the pH reading gets stabilized.
Rinse it with distilled water again.
Then on the meter it says 10 pH that mean I have to put the pH robe into the alkali
solution or solution with 10 ph.
And when the pH reading got stabilized rinse it with distilled water and then it is
calibrated.
The table below shows my results while calculating pH of different solutions.
Unknown solution Measured pH Acid, alkali or neutral Identity of solution
1 2.1 Acid Hydrochloric acid
2 3.4 Acid Hydrochloric acid
3 6.2 Acid Tap water
4 7.0 Neutral Distilled water
5 11.4 Alkali Sodium hydroxide
6 12.0 Alkali Sodium hydroxide
,For this experiment, the health and safety risk assessment include.
hazards Risks Precaution
Doing experiment without The chemical may damage I must wear lab goggles.
wearing goggles. my eyes.
The bags and chairs not I may can drop or fall while I put my chair and bag
stocked under the desk or holding the chemicals in my under the table.
table. hands.
Not wearing lab coat while The chemicals can damage I must wear lab coat.
using chemicals in the your skin or damage your
experiment. cloths.
The glass made instrument The glass can cut my skin. I handled the glass
like test tube or measuring instruments very carefully.
cylinder can break.
Not wearing gloves while The chemicals may damage Because I was chemicals
using chemicals. my skin. that why I wear gloves.
To calibrate digital scale,
For this calibration, I used a weight like 200g block.
I started the calibrating digital scale by pressing on button about 3 times. Then on the screen
of the balance it says ‘cal’ and start counting 4 to 1 after the counting I put the 200g block on
the scale. Then it calibrated. To check calibration is correct or not I put different weights less
than 200 g it displays on the scale which shows that it is calibrated. I must have to do this
calibration because I used digital balance about in every experiment.
To calibrate volumetric glassware.
For this part of calibration, I used volumetric pipette, beaker, distilled water, calibrated digital
balance and conical flask. I began with weighing the flask and then I start rinsing up the
volumetric pipette with distilled water. After rinsing it I filled it with a distilled water about
more than 25ml roughly 100ml and I filled it until the volumetric pipette does not touch the
bottom of the flask and this will give me more accurate readings. I have to make sure that
the bottom of the miniscule is touched to the line. and then I carefully took the tip of the
pipette out of the flask, and I pointed inside the flask that I already weighted it as I filled it
up. Then I weighed the flask with water. I repeated this step 3 times and got three different
results. The table below shows the results I got,
Run 1 Run 2 Run 3
Mass of empty 70.60 70.76 70.95
conical flask (g)
Mass of conical flask 95.45 95.74 95.87
and water (g)
, Mass of water 24.85 24.78 24.93
(g)
Average mass of 24.85
water(g)
Now using this table, I find the density of 25 cm3 of water at 25 degrees Celsius room
temperature.
My results calculation,
Volume of 1 gram water at 25 degree Celsius = 1.003 ml
Volume of 24.85 g water = 24.85 x 1.003 = 24.92455 cm 3
To find Density = mass/volume
Mass = 24.85g
Volume= 24.93455 cm3
density = 24..92455
= 0.99700897 or 0.997 g/cm3
Other groups results table (Diya and Jana’ s group)
Run 1 Run 2 Run 3
Mass of empty 69.52 69.89 69.71
conical flask (g)
Mass of conical flask 95.42 95.59 95.51
and water (g)
Mass of water 24.90 24.70 24.80
(g)
Average mass of 24.80
water(g)
Other group calculations,
Volume of 1 gram water at 25 degree Celsius = 1.003 ml
Mass = 24.80 g
Volume of 25 g water at 25 degrees Celsius = 24.8744 ml
Undertake titration and colorimetry to determine the concentration of
solutions.
In these experiments firstly I learned the risk that I might have to face in the lab and
precautions to eliminate any dangers that occurs. Then, I have developed the skills to make
and use different solutions like hydrochloric acid, sodium hydrogen sulphate and copper
sulphate. In addition of calibration I learned how to handle with different equipment.
According to the results of titration and colorimetry I learned how to find moles and
concentrations of different unknown solutions using graphs and algebraic calculations.
Calibration is a process of figuring out a measuring instrument to get the results of the
sample in more accurate and acceptable range. For example, in my experiments I calibrated
pH meter, digital balance and a volumetric glassware.
To calibrate pH meter,
First, I rinse it with distilled water.
Then on my pH meter it says 4 pH that is mean I have to put the pH robe into the
acidic solution or solution with 4 ph.
Wait until the pH reading gets stabilized.
Rinse it with distilled water again.
Then on the meter it says 7 pH that mean I have to put the pH robe into the
neutralized solution or solution with 7 ph.
Wait until the pH reading gets stabilized.
Rinse it with distilled water again.
Then on the meter it says 10 pH that mean I have to put the pH robe into the alkali
solution or solution with 10 ph.
And when the pH reading got stabilized rinse it with distilled water and then it is
calibrated.
The table below shows my results while calculating pH of different solutions.
Unknown solution Measured pH Acid, alkali or neutral Identity of solution
1 2.1 Acid Hydrochloric acid
2 3.4 Acid Hydrochloric acid
3 6.2 Acid Tap water
4 7.0 Neutral Distilled water
5 11.4 Alkali Sodium hydroxide
6 12.0 Alkali Sodium hydroxide
,For this experiment, the health and safety risk assessment include.
hazards Risks Precaution
Doing experiment without The chemical may damage I must wear lab goggles.
wearing goggles. my eyes.
The bags and chairs not I may can drop or fall while I put my chair and bag
stocked under the desk or holding the chemicals in my under the table.
table. hands.
Not wearing lab coat while The chemicals can damage I must wear lab coat.
using chemicals in the your skin or damage your
experiment. cloths.
The glass made instrument The glass can cut my skin. I handled the glass
like test tube or measuring instruments very carefully.
cylinder can break.
Not wearing gloves while The chemicals may damage Because I was chemicals
using chemicals. my skin. that why I wear gloves.
To calibrate digital scale,
For this calibration, I used a weight like 200g block.
I started the calibrating digital scale by pressing on button about 3 times. Then on the screen
of the balance it says ‘cal’ and start counting 4 to 1 after the counting I put the 200g block on
the scale. Then it calibrated. To check calibration is correct or not I put different weights less
than 200 g it displays on the scale which shows that it is calibrated. I must have to do this
calibration because I used digital balance about in every experiment.
To calibrate volumetric glassware.
For this part of calibration, I used volumetric pipette, beaker, distilled water, calibrated digital
balance and conical flask. I began with weighing the flask and then I start rinsing up the
volumetric pipette with distilled water. After rinsing it I filled it with a distilled water about
more than 25ml roughly 100ml and I filled it until the volumetric pipette does not touch the
bottom of the flask and this will give me more accurate readings. I have to make sure that
the bottom of the miniscule is touched to the line. and then I carefully took the tip of the
pipette out of the flask, and I pointed inside the flask that I already weighted it as I filled it
up. Then I weighed the flask with water. I repeated this step 3 times and got three different
results. The table below shows the results I got,
Run 1 Run 2 Run 3
Mass of empty 70.60 70.76 70.95
conical flask (g)
Mass of conical flask 95.45 95.74 95.87
and water (g)
, Mass of water 24.85 24.78 24.93
(g)
Average mass of 24.85
water(g)
Now using this table, I find the density of 25 cm3 of water at 25 degrees Celsius room
temperature.
My results calculation,
Volume of 1 gram water at 25 degree Celsius = 1.003 ml
Volume of 24.85 g water = 24.85 x 1.003 = 24.92455 cm 3
To find Density = mass/volume
Mass = 24.85g
Volume= 24.93455 cm3
density = 24..92455
= 0.99700897 or 0.997 g/cm3
Other groups results table (Diya and Jana’ s group)
Run 1 Run 2 Run 3
Mass of empty 69.52 69.89 69.71
conical flask (g)
Mass of conical flask 95.42 95.59 95.51
and water (g)
Mass of water 24.90 24.70 24.80
(g)
Average mass of 24.80
water(g)
Other group calculations,
Volume of 1 gram water at 25 degree Celsius = 1.003 ml
Mass = 24.80 g
Volume of 25 g water at 25 degrees Celsius = 24.8744 ml
