1. Vanda Parádi and Ágnes Melhardt Jurisich Miklós Gimnázium 10.D bilingual class

2. To drink or not to drink? - that is the question.

3. But what to drink? Coke? Coffee? Wine? Brandy? Water?

6. CaCO 3 +H 2 O+CO 2  Ca(HCO 3 ) 2 Limestone rocks Acidic rain waterCauses hard water MgCO 3 +H 2 O+CO 2  Mg(HCO 3 ) 2

9. German hardness 0 – 7 nk° very soft 0 – 7 nk° very soft 7 – 14 nk° soft 7 – 14 nk° soft 14 – 23 nk° medium 14 – 23 nk° medium above 23 nk°hard above 23 nk°hard

10. Advantages

11. Improves the taste of water Improves the taste of water

12. Calcium ions are good for your bones and teethCalcium ions are good for your bones and teeth

13. Good for brewing beer

14. Disadvantages

15. Wastes soap Wastes soap

16. Causes limescale in kettles and water boilers Causes limescale in kettles and water boilers Causes hot water pipes to become blocked Causes hot water pipes to become blocked

17. Although it has some disadvantages, we should drink hard water, because it’s healthier than the soft.

18. RDA 2.5 litres a day

19. Symptoms of too little intake: Weakness Weakness Wrinkled skin Wrinkled skin Irregular functioning of the heart Irregular functioning of the heart

20. Too much water: Blood becomes more dilute Blood becomes more dilute  Water moves into the cells Water moves into the cells  Swelling Swelling

21. Drink sufficient amount, but not too much hard water!!!