Kw, constants and Reactions

Question 1

What auto ionization in water

Answer 1

two water molecules react together to form hydronium and hydroxide ions

Question 2

Define Kw

Answer 2

at 25 degrees Celsius Kw=(hydronium)(Hydroxide)

Question 3

What are the reactions that form salts

Answer 3

1- acid + metal = salt + hydrogen ( redox reaction)
2- acid+ metal hydroxide = salt + water
3- acid + metal oxide = salt + water
4- acid + metal carbonate =salt+ Carbon dioxide + water
5- acid+ metal hydrogen Carbonate = salt + cardon doixide + water

Question 4

Define a Standard solution

Answer 4

solution of known concentration

Question 5

What is titration

Answer 5

are used to determine the concentration of an unknown solution a titration uses a standard solution to neutralize an acid or base of an unknown substance

Question 6

Define neutralization

Answer 6

the point where an acid and base have reacted so neither is in excess

Question 7

Describe the physical process of performing a titration

Answer 7

1- pipette a standard solution into a conical flask
2-Add an appropriate indicator to the flask
3- Add a solution of unknown concentration to the burette
4-Place the conical flask on a white tile under the burette
5-Add the solution from the burette to the conical flask one drop at a time
6- swirl the conical flask after each drop is added to ensure that the solution is mixed
7-Rinse the wall of the conical flask to wash down any drops that may have splashed
8- Close the tap on the burette when the solution in the conical flask has changes colour
9- Take the initial reading on the burette and then read the amount of solution that has been used.