Past Papers About Acid And Alkali Flashcards
An acid can be reacted with a base in a titration experiment?
(i)State the name of the type of the reaction when an acid react with a base?
Neutralisation
General equation for the reactions of an acid and a base is?
Acid+base->Salt + Water
Copper carbonated is added for the acid in the flask
The cooler carbonates is added one spatula measure at the time until the reaction is finnished
State two observation that would show the reactions has finished?
1) add until y oh see that the carbonates is still at the bottom of the chonical flask
2)No more bubbles/frizz
What is the meaning of the hazard symbol?
Health hazard
Name a piece of equipment which could measure out 50.0cm of dilute hydrochloric acid?
burrette
Give one precaution the student should take when using a barium hydroxide?
Safety goggles
Describe how the pH of the mixture is determined when a drop is place don a universal indicator paper
When pure water is dropped into a solution the indicator stays green if it’s neutral(7) this determines the strength of the substance if it’s acidic or alkalinity
Explain why litmus paper would not be suitable to use in this experiment?
- doesn’t mention the strength of the substance
- only sees red and blue
Sodium hydroxide solution was added to a solution of copper Sulfate
A precipitate of copper hydroxide and solution of sodium Sulfate is added
State what would be seen in the reaction?
Will go colourless
Describe the balanced equation for the reduction by adding a number of NaoH
2NaOH
Describe the pure fry sample or the precipitation of copper hydroxide from the reaction mixture?
1)Filter
2)Washed with pure substance
3)Warm place
State what could be used to measure the pH of a solution?
pH meters
Sodium choloride is neutral
Gives the pH of this solution
7
What is the chemical test to show the gas is carbon dioxide?
(A) bubbles the gas though limewater+turns cloudy
State what could be added to the sulftic acid to show when it has been neutralised by ammonia solution
Any indication
(NOT UNIVERSAL)
Q9
Cl2+H20-> Hcl
Q8
Burrette
Gives a safety precaution that could be taken during experiments?
Safety googles
Give an improvement to step 4 that would produce an accurate results
Measure scale
Q10 (iii)
B) from 1 to 12
If some methyl or range indicator is added to the acid in step 2 the mixture changes colour during the experiment.state the colour change
Start - red
End - yellow
Describe what you would see when some copper carbonates powder is added to the beaker of dilute sulfric acid
1) sees bubbling
2)powder dissolve
Give the formula of the ions in diffuse 6 that causes the Hydrogen chloride solution to be acidic
H+
What is the formula of a cations?
Na+
Place the metals of reactivity to less reactive
Most reactive : magnesium
Ions
Less reactive : Silver
When diblute hydrochloride acid is added to potassium carbonate a gas is evolved
Describe the test for the gas
Carbonate dioxide put acid and carbonate in a tube and limewater then wait until cloudy
Q12) (ii)
C(put a lighted split at the open end of the test)
State the observation made in the test that shows that the gas is hydrogen
Heard a squeaky pop
Solution of doubles salts can react together to form an insoluble form an insoluble salt
Neutrasliation
