Dilute nitric acid reacts with solid sodium carbonate powder. Sodium carbonate is a weak base.
A student investigates how the pH changes as sodium carbonate is added to dilute nitric acid.
Here is the method used:
Step 1: Use a volumetric pipette to transfer 25.0 cm3 of dilute nitric acid into a glass beaker. Step 2: Measure and record the pH of the acid using a calibrated pH probe. Step 3: Add a 0.2 g portion of sodium carbonate powder and stir the mixture thoroughly. Step 4: Measure and record the pH. Step 5: Repeat Steps 3 and 4 until there is no further change in the pH.
Give one safety precaution that the student should take during this experiment.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
