What is the functional group being investigated today?

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Presentation transcript:

What is the functional group being investigated today?

Carboxylic acids To be able to recognise a carboxylic acids. Learning Objectives: To be able to recognise a carboxylic acids. To investigate some reactions of carboxylic acids. To apply prior knowledge of acid reactions to predict products of carboxylic acid reactions. Keywords: Carboxylic acid, functional group Homework: Complete the worksheet “Acids for smoother skin”. An insight into the applications of carboxylic acids Due: Tues 9th Feb

Some carboxylic acids around us H Ascorbic acid Ethanoic acid Oxalic acid Tartaric acid Citric acid Tannic acid

Some carboxylic acids around us Ethanoic acid Oxalic acid Lactic acid Pentanoic acid

Activity – Carboxylic acids and their reactions Complete Ac7.3 for either methanoic or ethanoic acid carboxylic acid. Draw the structure of your carboxylic acid. Write a general word equation for each reaction using your knowledge of how acids react. Use your book (p184-185) to help you write word equations for each reaction of your chosen carboxylic acid . Extension: Construct a balanced symbol equation for each reaction. O H Caution: When heating, do so VERY gently as it is likely to boil over. Always heat with the boiling tube at an angle AWAY from you and your peers.

Three key reactions of carboxylic acids Metal + carboxylic acid Metal oxide + carboxylic acid Metal carbonate + carboxylic acid

True or false Ethanol is a carboxylic acid The functional group of a carboxylic acid is COOH True Carboxylic acids react with metals to produce a salt and hydrogen True Carboxylic acids have a lower pH than acids such as HCl and H2SO4 False When ethanoic acid reacts with sodium oxide the products are sodium ethanoate and water True

Can you…? Recognise a carboxylic acid. Predict the products of reactions between carboxylic acids and metals, metal oxides and metal carbonates. Write a word equation for each of the reactions investigated today. Traffic light each one with your colour cards.