(Name) Practical Scientific Procedures and Techniques 1
Unit 2: Learning Aim A
(Name)
Department of Science, (School)
Biomedical Science
(Due Date)
, (Name) Practical Scientific Procedures and Techniques 2
Unit 2: Learning Aim A
Titration to Determine the Concentration of a Solution of Sodium Hydroxide (NaOH)
Risk Assessment
Hydrochloric acid (HCl) is a hazardous chemical because it can irritate the skin if it
touches it. A lab coat and gloves are worn to prevent the acid from contacting the skin.
Additionally, the experiment is performed standing in case the acid spills. Equipment
including volumetric flask, beaker, glass rod, and measuring cylinder is made of fragile glass
and if broken, pose a risk of cuts and scratches. All fragile equipment is handled cautiously to
counteract this risk. Sodium carbonate, methyl orange indicator and sodium hydroxide can
burn the eyes, so goggles are worn to protect them. Additionally, methyl orange and sodium
hydroxide can irritate the gastrointestinal tract if ingested. All liquids, including water, can
become a slipping hazard if spilt, so must be handled with care.
Part A Preparation of a Standard Solution of Sodium Carbonate
Method
First, the weighing scales are calibrated using standard weights (50g, 20g, 100g). The
calibration is done by comparing the scale measurement to the actual mass of the weight and
adjusting the scales until the difference is minimal. After weighing all standard weights on
the scales, the mean weight displayed was (50.02g, 20.06g, 100.06g), respectively. Standard
weight mass results are subject to a percentage error of (0.00490% for 50g standard weight),
(0.005% for 20g standard weight) and (0.006% for 100g standard weight). The percentage
error of the calibration showed that the scales were sufficiently accurate.
Unit 2: Learning Aim A
(Name)
Department of Science, (School)
Biomedical Science
(Due Date)
, (Name) Practical Scientific Procedures and Techniques 2
Unit 2: Learning Aim A
Titration to Determine the Concentration of a Solution of Sodium Hydroxide (NaOH)
Risk Assessment
Hydrochloric acid (HCl) is a hazardous chemical because it can irritate the skin if it
touches it. A lab coat and gloves are worn to prevent the acid from contacting the skin.
Additionally, the experiment is performed standing in case the acid spills. Equipment
including volumetric flask, beaker, glass rod, and measuring cylinder is made of fragile glass
and if broken, pose a risk of cuts and scratches. All fragile equipment is handled cautiously to
counteract this risk. Sodium carbonate, methyl orange indicator and sodium hydroxide can
burn the eyes, so goggles are worn to protect them. Additionally, methyl orange and sodium
hydroxide can irritate the gastrointestinal tract if ingested. All liquids, including water, can
become a slipping hazard if spilt, so must be handled with care.
Part A Preparation of a Standard Solution of Sodium Carbonate
Method
First, the weighing scales are calibrated using standard weights (50g, 20g, 100g). The
calibration is done by comparing the scale measurement to the actual mass of the weight and
adjusting the scales until the difference is minimal. After weighing all standard weights on
the scales, the mean weight displayed was (50.02g, 20.06g, 100.06g), respectively. Standard
weight mass results are subject to a percentage error of (0.00490% for 50g standard weight),
(0.005% for 20g standard weight) and (0.006% for 100g standard weight). The percentage
error of the calibration showed that the scales were sufficiently accurate.
