Lab: Testing for Acids and Bases

Topics: Hydrochloric acid, PH, PH indicator Pages: 12 (3086 words) Published: September 16, 2012
Acids and bases surround us everywhere, and are an important part in our lives. From the products we use to clean our ovens to the grapes we eat, acids and bases are everywhere! The purpose of this lab is to observe the different ways to indicate and differentiate between an acid and a base by observing different reactions between common chemicals and substances. HYPOTHESIS

Please refer to the observations
1)Reacting active metals with Sulfuric acid
2)Reacting active metals with Hydrochloric acid
3)Reacting oxides with Sulfuric acid
4)Reacting oxides with Hydrochloric acid
5)Potassium Hydroxide with Water/ Sulfuric acid/ Hydrochloric acid 6)Calcium carbonate with Water/ Sulfuric acid/Hydrochloric acid 7)Testing soap water

Erlenmeyer flask
4 test tubes
Test tube rack
Drop plate
Plastic drop plate
Test tube holder
Multiple Medicine droppers
Conductor 

It is important that during all times you follow instructions, keep your goggles on and act extremely carefully when handling chemicals. Wash the medicine droppers and test tubes properly if needed to be reused otherwise the experiment will be faulty. Use the pH scale below to determine the meaning of each colour change, know that blue litmus paper turns pink in acidic solutions, pink litmus paper turns blue in basic solutions and phenolphthalein remains clear in acidic solutions and turns pink in basic solutions. In neutral solutions none of the indicators change colour.

Experiment #1:
Active metals and Sulfuric acid Hypothesises a) The zinc when reacting with the sulfuric acid will disintegrate, cause bubbles to form and the solution will be acidic b) The magnesium when reacting with the sulfuric acid will disintegrate, cause an odour and a gas release, the solution will be acidic c) The calcium filings when reacting with the sulfuric acid will change the colour of the solution, participate in a gas release, cause an odour and the solution will be acidic 1)Set the drop plate on the counter

2)With a medicine dropper suck up the sulfuric acid
3)Drop a little of the liquid into three separate circles
4)Put a block of zinc into one circle
5)Put a little of the magnesium strip into the second circle 6)With a spoon put a little of the calcium filings into the third circle 7)Observe the reactions
8)Test each circle with an indicator to determine the pH level Observations a) The zinc immediately disintegrated, bubbles, released a gas as well as an odour, all indicating signs of a chemical change. On testing with blue litmus paper the slip turned pink, the pink litmus paper remained pink and the pH paper turned red. The methyl orange remained orange, the phenolphthalein remained clear and the methyl blue remained blue. This proves that the solution was acidic. It was also a good conductor. Zinc+ Sulfuric acid  Zinc Sulphate+ Hydrogen gas

Zn + H2SO4  ZnSO4 + H2
A+BAB (Single displacement)
b) The magnesium ribbon disintegrated and bubbled in the acid for a long period of time, there was an odour release and an exothermic reaction, all indicating signs of a chemical change. On testing with blue litmus paper the slip...
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