What does this reaction tell us about the nature of non-metal oxides? What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)? Zn (OH) 2 + 2NaOH → Na 2 [Zn (OH) 4] Zinc hydroxide react with sodium hydroxide to produce tetrahydroxozincate (II) sodium. the metal is more reactive than hydrogen and; the metal's own hydroxide can act as acid towards this base (amphoteric hydroxide). What happens when zinc granules are treated with dilute solutions of : Solution A is a sodium hydroxide solution. zinc granules are heated with sodium hydroxide solution, then sodium zincate salt and hydrogen gas are formed. sodium hydroxide to form sodium zincate with the liberation of hydrogen. Zinc passes both tests and so, party time! Example: Calcium hydroxide reacts with carbon dioxide to form calcium carbonate and water. What happens when zinc granules are heated with sodium hydroxide solution? What happens when copper sulphate crystals are heated strongly? Name the gas evolved when zinc granules are treated/heated with : What happens when a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide? P and Q are aqueous solutions of sodium chloride and sodium hydroxide respectively. This reaction takes place at a temperature near 550°C. Sodium hydroxide - concentrated solution. What happens when a concentrated solution of sodium chloride (brine) is electrolysed? (a) What happens when zinc granules are heated with sodium hydroxide solution? Explain with the help of an example. (a) When zinc granules are heated with sodium hydroxide solution, then sodium zincate salt and hydrogen gas are formed. When chlorine and sodium hydroxide being produced during the electrolysis of brine are allowed to mix a new chemical is formed. Zn + 2NaOH → Na 2 ZnO 2 + H 2 Sodium zincate Solution B is a weak acid. Zinc will react with Sodium Hydroxide to from Sodium Zincate. In this reaction Zinc will not displace sodium from sodium hydroxide, but will displace Hydrogen as shown below: This reaction is accompanied by evolution of Hydrogen gas. (b) What happens when bases react with non-metal oxides? What happens when dilute hydrochloric acid is added to sodium carbonate? Example: Calcium hydroxide reacts with carbon dioxide to form calcium carbonate and water. Zinc reacts with hot and conc. (a) When zinc granules are heated with sodium hydroxide solution, then sodium zincate salt and hydrogen gas are formed. It's displacing hydrogen. In effect zinc is not displacing sodium. Write equation of the reaction which takes place. (b) When bases react with non-metal oxides, then salt and water are formed. Zinc react with sodium hydroxide to produce zincate sodium and hydrogen. We expect a metal to do this from a hydroxide base if. (b) When bases react with non-metal oxides, then salt and water are formed. 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