Potential 5/6 markers: TLC Colorimetry Method Manganate Titration DNA damage and effect on enzymes Re-Crystallization technique (choice of solvent etc)
There are a couple more that have come up but couldn't remember them all
What are you guys getting in past papers? Im getting anything between 65-70 marks which usually ends up being As (somehow?) but for some reason I still dont feel confident for this exam one bit....
Buffer solutions resist change in pH when a small amount of acid or alkali is added. This is because the buffer solution forms an equilibrium reaction.
Buffer solutions are a solution of weak acid or alkali and its constituent salt.
When acid is added, equilibrium position shifts to reduce the H+ concentration so to stop the pH decreasing (because more H+ means a smaller pH).
When alkali is added, the system tries to counteract the change by increasing the concentration of H+ so to stop the pH increasing.