| Front | Why is the rate of reaction decrease (by the green arrow)?
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| Back | Because a lot of the reactant molecules already reacted and turn into product. |
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| Front | What do sedimentation tanks do to sewage? |
| Back | Produced a liquid effluent and a semi solid sludge which sinks to the bottom of the tank. |
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| Front | Why do we add the acid drop by drop just before the colour change? |
| Back | To be as accurate as possible |
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