acids and bases

    Cards (45)

    • When a substance is neutral describe the concentration of H+ and OH- ions
      they are equal
    • The ion that has a higher concentration in alkalis is hydroxide ions (OH-)
    • The ion that has a higher concentration in acids is hydrogen ions (H+)
    • When an solution is diluted, what is added?
      water
    • When an acid is diluted, the pH increases to get closer to neutral/pH 7
    • When an alkali is diluted, the pH decreases to get closer to neutral/pH 7
    • If an insoluble metal oxide is added to a solution, what effect does this have on the pH?
      nothing because it's insoluble
    • The test for carbon dioxide turns limewater cloudy.
    • What is the test for carbon dioxide?
      turns limewater cloudy
    • What are the products when a metal reacts with an acid?
      salt and hydrogen gas
    • Salt and hydrogen gas is produced when a metal reacts with an acid
    • The test for hydrogen gas is it burns with a pop.
    • What is the test for hydrogen gas?
      Burns with a pop
    • What practical technique could be used for a neutralisation?
      titration
    • The 2 main pieces of apparatus used to measure in a titration is a burette and a pipette.
    • What 2 main pieces of apparatus are used to measure in a titration?
      burette and pipette
    • What is added to the reaction to see the end point of a reaction?
      Indicator (NOT universal indicator)
    • What forms when ammonia reacts with an acid?
      Ammonium salt
    • What is the test for ammonia gas?
      Turns damp pH paper blue
    • The test for ammonia gas turns damp pH paper blue
    • The reaction that produces an insoluble product from two solutions is a precipitate reaction
    • How can a precipitate easily be separated from a mixture?
      Filtration
    • The reaction between an acid and a base is called neutralisation.
    • What do we call the reaction between an acid a base?
      neutralisation
    • What are the three types of bases?
      Metal oxide, Metal Hydroxide, Metal Carbonate
    • What are the products of a neutralisation?
      Water + salt ( + carbon dioxide if metal carbonate)
    • the pH scale ranges from 0-14.
    • Alkalis have a pH of >7
    • Acids have a pH of <7
    • pH 7 is neutral
    • Ions that remain unchanged in a reaction are called?
      spectator ions
    • How can we know which ions are spectator ions?
      They will be (aq) before and after the arrow
    • Non-metal oxides dissolve to form what type of solution?
      Acidic
    • Non-metal oxides dissolve to form acidic solutions
    • Name the three non-metal oxides that make acids
      Sulfur Dioxide (SO2), Carbon Dioxide (CO2), Nitrogen oxide (NO2)
    • Metal oxides dissolve in water to form what type of solutions?
      Alkaline
    • Metal oxides dissolve to form alkaline solution
    • What does concordant mean?
      values within 0.2cm3 of each other
    • What values are used to calculate an average volume of a titration?
      Concordant titre values
    • Values within 0.2cm3 of each other are concordant.