In term 1, most of the practical done is on a term 2 chemistry topic called acids and bases. Although acid is a word that everyone knows, but the knowledge of it and the uses of it is very useful and we often neglect them in our daily lives. Just like the fruits we eat, all of them have a certain amount of acid in them which are beneficial to the body. Also, hydrochloric acid, a very strong acid that burns, is found in our stomach for digestion! Therefore, acid has much more to learn than what I thought.
The third practical I have done is to understand the reaction between acid and metal. I was given 4 test tubes, a test tube rack, Bunsen burner and a lighter as apparatus. The materials being tested were dilute hydrochloric acid, magnesium ribbon, zinc powder, iron fillings, copper turnings and a wooden splint.
These are the steps to our practical.
1. Pour dilute hydrochloric acid into a clean test tube to a depth of 3cm.
2. Drop a piece of magnesium ribbon into the test tube of dilute hydrochloric acid.
3. Quickly close the mouth of the test tube with your thumb for a few minutes.
4. Light a wooden splint and hold it at the mouth of the test tube and observe what happens.Place a red and blue damp litmus paper over the mouth of test-tube. Record your observations.
5. Repeat step 1 to 4 using:
(a) iron fillings
(b) zinc powder
(c) copper turnings
I was thinking what does a litmus paper do at first and finally, Ms Nada, my science teacher, told the class that red and blue litmus paper can test whether a substance is acidic or alkaline or neutral when used together. If a red litmus paper turned blue, it means that the substance is alkaline and vice versa for the blue litmus paper.
The observation seen for all the metals are quite similar except for their appearance due to different reactivity of each metal. All of the experiments have a pop sound when a burning splint is brought near it and the read and blue litmus paper did not change in colour. Thus, we can conclude that the gas produced from the reaction would be hydrogen gas. Therefore, the equation formed when acid comes together with metal is:
Dilute acid + metal→salt + hydrogen gas
There are 2 more practicals we did for the whole term. They are acid meets carbonate and acid meets ammonium salt. All of them helps me derived with equations when there are such reactions happening.
For acid meets carbonate, carbon dioxide is produced, salt is produced as well as water. Equation: Acid + carbonate→Salt + Water + Carbon dioxide
For acid meet ammonium salt, ammonia gas, salt and water is produced. Equation: Acid + Ammonium salt→Table salt + ammonia gas + water
The third practical I have done is to understand the reaction between acid and metal. I was given 4 test tubes, a test tube rack, Bunsen burner and a lighter as apparatus. The materials being tested were dilute hydrochloric acid, magnesium ribbon, zinc powder, iron fillings, copper turnings and a wooden splint.
These are the steps to our practical.
1. Pour dilute hydrochloric acid into a clean test tube to a depth of 3cm.
2. Drop a piece of magnesium ribbon into the test tube of dilute hydrochloric acid.
3. Quickly close the mouth of the test tube with your thumb for a few minutes.
4. Light a wooden splint and hold it at the mouth of the test tube and observe what happens.Place a red and blue damp litmus paper over the mouth of test-tube. Record your observations.
5. Repeat step 1 to 4 using:
(a) iron fillings
(b) zinc powder
(c) copper turnings
I was thinking what does a litmus paper do at first and finally, Ms Nada, my science teacher, told the class that red and blue litmus paper can test whether a substance is acidic or alkaline or neutral when used together. If a red litmus paper turned blue, it means that the substance is alkaline and vice versa for the blue litmus paper.
The observation seen for all the metals are quite similar except for their appearance due to different reactivity of each metal. All of the experiments have a pop sound when a burning splint is brought near it and the read and blue litmus paper did not change in colour. Thus, we can conclude that the gas produced from the reaction would be hydrogen gas. Therefore, the equation formed when acid comes together with metal is:
Dilute acid + metal → salt + hydrogen gas
There are 2 more practicals we did for the whole term. They are acid meets carbonate and acid meets ammonium salt. All of them helps me derived with equations when there are such reactions happening.
For acid meets carbonate, carbon dioxide is produced, salt is produced as well as water.
Equation: Acid + carbonate → Salt + Water + Carbon dioxide
For acid meet ammonium salt, ammonia gas, salt and water is produced.
Equation: Acid + Ammonium salt → Table salt + ammonia gas + water