Investigating the pH value of a commercial product Aim: To test the manufacturer’s claim on a commercial product. Hypothesis: If the Palmolive® naturals shower gel was tested by the indicator drop, its pH trial will be equal to seven (neutral). Equipment list: 30 ml of Palmolive® naturals shower gel 3 Watch glasses Measuring cylinder Universal Indicator liquid Universal Indicator pH colour chart Spatula Sticky note and pen (for labelling) Method: Lay out all equipment and label (using the sticky not and pen) one of the watch glasses as trial 1. Measure 10ml of the Palmolive® naturals shower gel using the measuring cylinder and apply onto the labelled watch glass. Put 3 drops of the universal indicator liquid onto 1. Use spatula to combine the two substances together. Observe closely to see any change of colour, and use the Universal Indicator pH colour chart to note the pH value. Record results in a table. Repeat steps one to six, for watch glasses two and three. Independent Variables: Palmolive® naturals shower gel. Dependant variables: The pH value of the Palmolive® naturals shower gel. Controlled variables: Same amount of shower gel tested in each trial, same temperature, same amount and quality of universal indictor drops used in each trial. All watch glasses were clean, with no trace of any other substance on them. Risk assessment: Even though the inherent level of risk for this experiment is low, there are some precautions that should be made in order to eliminate the risks.
Investigating the pH value of a commercial product Aim: To test the manufacturer’s claim on a commercial product. Hypothesis: If the Palmolive® naturals shower gel was tested by the indicator drop, its pH will be equal to seven (neutral). Equipment list: 30 ml of Palmolive® naturals shower gel 3 Watch glasses Measuring cylinder Universal Indicator liquid Universal Indicator pH colour chart Spatula Sticky note and pen (for labelling) Method: Lay out all equipment and label (using the sticky not and pen) one of the watch glasses as trial 1. Measure 10ml of the Palmolive® naturals shower gel using the measuring cylinder and apply onto the labelled watch glass. Put 3 drops of the universal indicator liquid onto trial 1. Use spatula to combine the two substances together. Observe closely to see any change of colour, and use the Universal Indicator pH colour chart to note the pH value. Record results in a table. Repeat steps one to six, for watch glasses two and three. Independent Variables: Palmolive® naturals shower gel. Dependant variables: The pH value of the Palmolive® naturals shower gel. Controlled variables: Same amount of shower gel tested in each trial, same temperature, same amount and quality of universal indictor drops used in each trial. All watch glasses were clean, with no trace of any other substance on them. Risk assessment: Even though the inherent level of risk for this experiment is low, there are some precautions that should be made in order to eliminate the risks.
Senior_Science_Resources_-_Assessment_Task_-_Lifestyle_Chemistry.docx