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Determining Acid Concentration - Coggle Diagram
Determining Acid Concentration
Common Household Items (Acid)
Soluble
Types of acids found at home
carbonic acid
soft drinks
coca cola
hard to indicate end point due to dark colour
sparkling water
a possible choice, but the carbonation may 'evaporate'
lactic acid
milk
pH is relatively neutral, bad choice
ascorbic acid
vitamin c tablets
aspirin
Active ingredients
Can be either solid of liquid, but MUST be soluble
Bases
Soluble
Strong and weak bases
NaOH, Na2CO3
Using strong base NaOH will give an endpoint on the equivalence point
Indicator
Phenolphthalein
Base: Colourless
Neutral: pink
purple to clear easier to identify compared to methyl orange indicator (explicit endpoint), back titration on;ly
Clear to pink/purple for normal titration
Phenolphthalein will be used as the equivalence point is on the end point
Methyl orange
Base: orange
Pink/purple
Pros and cons
Aspirin (FINAL IDEA)
acetylsalicylic acid
Weak acid, practially insoluble in water
Using ethanol to dissolve: Ethanol can dissolve non-polar molecules
Easy to analyse as it is in pure form, minimal to none impurities
PURCHASE DISPERSABLE TABLETS
, able to dissolved and titrated normally
What is an Acid
Molecule capable of donating protons
Weak and Strong acids
Strong acids' H ions fully disassociate
Weak Acids partially disassociate the H ions
Aspirin is a weak acid as H ions don't fully disassociate in water
