Acids And Bases Flashcards
The ph scale is …
A measure of how acidic or alkaline a solution is
The Lower the pH of a solution , the more ____ it is
Acidic
The ____ the pH of a solution , the more acidic it is .
Lower
A neutral substance ( eg . Pure water ) has a pH of ….
~7
What pH would bleach be ?
~12
What pH would washing up liquid be ?
~8.5
What pH would lemon juice have ?
3
What pH would car battery acid have ?
~1
An indicator is …
( in acids / pH scale )
A dye that changes colour depending on whether it’s above or below a certain pH
Wide range indicators are ….
Substances that gradually change colour as its pH changes
What is universal indicator useful for ?
Estimating the pH of a solution
A pH prob attached to a pH meter can also be used …
To measure pH electronically
What’s more accurate , a pH probe or indicator ?
The pH probe
How do you read a pH probe ?
The number of the pH is shown as a number on the display of the pH probe
When acids dissolve in water , they form solutions with a pH of ….
Less than 7
Acids form H+ ions in ….
Water
Bases have pHs greater than ….
7
Alkalis are bases that dissolve in ____ to form solar ions with a pH greater than 7
Water
Alkalis are bases that dissolve in water to form solar ions with a pH ____
Greater than 7
Alkalis form OH- ions in ….
Water
The reaction between acids and bases is called …..
Neutralisation
Hydrogen (H+) ions react with hydroxide (OH-) ions to produce ….
Water
What is this equation showing ?
H+ (aq) + OH- (aq) —> H2O (I)
Neutralisation between acids and alkalis
When you add an indicator to acid or alkali during neutralisation , when will the indicator change colour ?
When the reaction is over
What colour would you expect universal indicator to turn if you added it to lemon juice ?
Red / orange
The pH of a solution is 8 . Is the solution acidic or alkaline ?
Alkaline closer to neutral
