1 / 12

Acids and alkalis Starter Write down any three facts you recall to do with acids or alkalis.

Acids and alkalis Starter Write down any three facts you recall to do with acids or alkalis. Any names? Any uses? How do we detect them?. Acids and alkalis Starter Unscramble the words to reveal some acids and alkalis: dica cirtin umiods yhorxddie yhrolcdhciro cida. Acids and alkalis

verdi
Download Presentation

Acids and alkalis Starter Write down any three facts you recall to do with acids or alkalis.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Acids and alkalis Starter Write down any three facts you recall to do with acids or alkalis. Any names? Any uses? How do we detect them?

  2. Acids and alkalis Starter Unscramble the words to reveal some acids and alkalis: dica cirtin umiods yhorxddie yhrolcdhciro cida

  3. Acids and alkalis Starter Unscramble the words to reveal some acids and alkalis: dica cirtin nitric acid umiods yhorxddie sodium hydroxide yhrolcdhciro cida hydrochloric acid

  4. Key facts you may know • Acids: from the latin “acidus” (sour), pH1-6 and found in our stomachs, vinegar and some batteries. • Alkalis: from arabic “al qalīy” (plant ash), pH 8-14, found in detergents, added to soil to help some crops grow and to make soap.

  5. Atomic facts to record • Acids: ALL contain “H” - hydrogen. HCl is hydrochloric acid HNO3 is nitric acid H2SO4 is sulfuric acid • Alkalis: Often contain a metal and “OH” - hydroxide NaOH is sodium hydroxide LiOH is lithium hyrdoxide

  6. Atomic facts to record • When they react in the correct proportions, they cancel each other out – neutralisation: sodium hydroxide + nitric acid → sodium nitrate + water (pH 12) (pH 2) (pH depends (pH 7) on the salt)

  7. 1) Use a measuring cylinder and measure 10 cm3 hydrochloric acid into a beaker. 2) Use a measuring cylinder and measure 10 cm3 sodium hydroxide and add about 9 cm3 to your beaker and stir it using the glass rod. 3) Add sodium hydroxide a few drops at a time. Test a drop from the beaker each time, until the blue litmus does not turn red – you have now used up all the acid (it is neutralised). 4) Pour the solution you have made into an evaporating dish. Heat the solution gently using a water bath. Be careful of a spitting solution! 5)Stop heating when crystals appear, DON'T let it boil dry. Allow to cool. .

  8. Writing the reaction Acid + Alkali → Salt + Water Can you write a word equation for our reaction we just carried out? Can you write a symbol equation? Using the symbols below? NaOH , HCl, H2O, NaCl

  9. Writing the reaction Acid + Alkali → Salt + Water Can you write a word equation for our reaction we just carried out? hydrochloric acid + sodium hydroxide → sodium chloride + water Can you write a symbol equation? Using the symbols below? HCl + NaOH → NaCl + H2O

  10. Writing the reaction Acid + Alkali → Salt + Water Can you write a word equation for our reaction we just carried out? hydrochloric acid + sodium hydroxide → sodium chloride + water Can you write a symbol equation? Using the symbols below? HCl + NaOH → NaCl + H2O The H in the acid has been replaced by the metal.

  11. Writing the reaction Acid + Alkali → Salt + Water You always make water. The salt has 2 words and they depend on the acid and alkali used. The salt gives us the surname: • hydrochloric acid makes a chloride • nitric acid makes a nitrate • sulfuric acid makes a sulfate The metal in the alkali gives us the first name: • sodium hydroxide has sodium

  12. To consolidate 8B41a – help to consolidate the naming of salts 8B41b – same reactions but some of the chemicals have already been placed. 8B4 2 – summary questions for the whole lesson.

More Related