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Acid Alkali Hazards

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Acid Alkali Hazards

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    1. D. Crowley, 2008 Acid & Alkali Hazards

    2. Acid & Alkali Hazards To know the hazards involved when using acids and alkalis Wednesday, April 04, 2012

    3. Dangers There are lots of acids and alkalis in the home that are relatively safe, however in the laboratory we sometimes use much more dangerous chemicals… How can you tell which chemicals are safe, and which are dangerous? Hazard symbols are used on bottles (and vehicles) that contain hazardous chemicals – they can be identified by anyone, regardless of language

    4. Dangers

    5. Dangers Hazard symbols show us why the chemical is dangerous…

    6. Risks Today you are going to carry out an experiment investigating household substances, identifying if it is an acid or alkali, as well as the pH of the substance (using UI) Complete a risk assessment for the practical (consider the risks, how we can minimise them, and what to do if they occur)

    7. Risks Sensible laboratory behaviour as always (no running) Hair tied back No eating, and washing hands after experiment has completed Depending on strength of acid/alkali this could be an irritant/harmful (blistering of skin) or even corrosive (destroys skin) if there is contact Goggles to be on at all times and hands to be washed immediately if acid/alkali touches skin

    8. Experiment Test a variety of household substances, identifying if they are an acid or alkali, and what their strength is (pH) - record your results in a table

    9. Acid & Alkali Examples

    10. Not hazardous Why is it that lemonade is not considered hazardous, even though it contains lemon juice which has a pH of ~2? Although lemon juice has a low pH it is not concentrated enough in lemonade to make it dangerous – although lemon juice on its own will still sting if it gets in a cut The concentration of lemon juice in lemonade is very low (water has been added to it, which increases the overall pH closer to neutral) which is why we can drink it!

    11. Hazard Symbols

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