acids + alkalis - chemistry

year 10

what are the 4 most common indicators

litmus , universal , penolphalien , methyl orange

which indicator turns red in acid and yellow in alkali?

methyl orange

what does penopathalien turn to if it is an alkali

colourless

what different substances do alkali and acids release in water

alkali = releases OH- ions in water and acids release H+ ions in water

what is a neutralisation reactions equation

acid + alkali/base = salt + water

apparatus used for titration

• burette

• conical flask

• pippette

• penophalien indicator

• alkali

• acid

titration method

• add a measured volume of acid to the Burette

• add a known volume of alkali and a few drops of penophalien indicator to a conical flask

• hold the Burette over the conical flask and slowly add the acid to the solution

• whilst adding , swirl the conical flask to speed up reaction

• stop once solution turns pink ( acid)

• repeat 3 times and calculate mean acid needed