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Chapter 2.16 Acids, alkalis and titrations - Summary Pearson Edexcel International GCSE (9-1) Chemistry Student Book - Chemistry

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Summary study book Pearson Edexcel International GCSE (9-1) Chemistry Student Book of Jim Clark (Chapter 2.16) - ISBN: 9780435185169, Edition: Student edition, Year of publication: - (.)

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2 - 16 Acids, alkalis and titrations


pH and indicators
●




● pH determined by relative (ratio) concentration of H+/OH- ions: ***pH < 7, H+ ↑,
OH- ↓; pH > 7, H+ ↓, OH- ↑
●




● ***
Acid Neutralised Alkali

Red litmus (石蕊) red red blue

Blue litmus red blue blue

Methyl orange red peachy orange yellow
(甲基橙)

Phenolphthalein colourless colourless pink
(酚酞)



1

, Universal indicator red~orange green blue~purple




Acids (pH <7)
● All acids contain hydrogen (in which all acids have replaceable H)
● When acids in water, dissociate (break apart) forming hydrogen ions (H+)
● ***Common acids to know:
Acid Formula

Hydrochloric acid HCl

Nitric acid HNO3
- Nitrous acid - HNO2

Sulphuric acid H2SO4
- Sulphurous acid - H2SO3

Ethanoic acid CH3COOH

Phosphoric acid H3PO4
- Phosphorous acid - H3PO3




2
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Jim Clark Edexcel International GCSE (9-1) Chemistry Student Book
Publisher: Unknown ISBN: 9780435185169 Edition: Unknown

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