Thursday, January 28, 2016

LC Chemistry Anion Tests

Test for Chlorides:
 Add silver nitrate solution to sample.
Forms a white ppt. which dissolves in ammonia.

Test for Carbonates and Hydrogencarbonates:
Add HCl, forms a white ppt.
To distinguish between Carbonates and Hydrogencarbonates:  add Magnesium sulfate solution which forms a white ppt. in the case of the carbonate but not in the case of the hydrogencarbonate.

Test for Sulfates and Sulfites:
Add Barium sulfate solution which forms a white ppt. in each case.
Add HCl, the Barium sulfate will remain but the Barium sulfite will dissolve.

Test for Nitrates:
Add acidified Iron (II) sulfate solution and conc. Sulfuric acid down the side of the tt.
Forms a brown ring at the junction between the two layers.

Test for Phosphates:
Add ammonium molybdate solution and nitric acid.
Heat to less than 40C.
Forms a yellow ppt. which dissolves in ammonia.

Monday, January 25, 2016

LC Biology - Digestion during Germination

DNA Gel Electrophoresis

Ms Higgins with a variety of year groups carrying out DNA Gel Electrophoresis

Friday, January 8, 2016

BT Young Scientist 2016

Well done to all our students who took part in this year's BT Young Scientist Awards. A special mention to Oisin, Michael, Rory, Megan and Rebecca who are pictured below at the main event. Many thank to Ms Higgins for all her work.

LC Biology - Enzyme Immobilisation

Review of Enzyme Immobilisation from Ms Higgins' 5th year biology class