dro asked in Science & MathematicsChemistry · 6 months ago

Which substances have an alkaline pH? Select the TWO answers that are correct.?

[] battery acid

[] orange juice

[] coffee

[] drain cleaner

[] baking soda

6 Answers

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  • 6 months ago

    "Alkaline pH" ........ this means the solution is basic and the pH is greater than 7

    [] battery acid .... for car batteries, the acid is sulfuric acid, H2SO4, not basic

    [] orange juice ... citric acid, not basic

    [] coffee ............. all kinds of stuff, but acidic, not basic

    [] drain cleaner .. some drain cleaners contains NaOH which IS basic, but some drain cleaners contain sulfuric acid, which is not basic.

    [] baking soda ....sodium bicarbonate, NaHCO3, dissolves in water to make a basic solution.

    NaHCO3(s) --H2O--> NaOH(aq) + CO2(aq)

    ..... based on:

    ..... NaHCO3 --> Na+ + HCO3^-

    ..... HCO3^- <==> OH- + CO2

    ..... HCO3^- + OH- <==> H2O + CO3^2- .... but [CO3^2-] will be negligible

    ..... dissolving NaHCO3 will produce a collection of ions in varying concentrations: Na+ + HCO3- + OH- + CO3^2- + CO2(aq)

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  • Lv 7
    6 months ago

    anything acidic is an acid.

    anything that NEUTRALIZES acid is alkaline.

    coffee and baking soda are both below 7pH, which makes them alkalinic.

    • pisgahchemist
      Lv 7
      6 months agoReport

      This answer has some errors. Yes, coffee is acidic, but not sodium bicarbonate. A solution of NaHCO3 is basic. A 0.10M solution of NaHCO3 has a pH of 8.31.

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  • 6 months ago

    The main ingredient in battery acid is sulfuric acid. Orange juice contains citric acid. From reading articles on face book, coffee contains weak acids. The main ingredient in drain cleaner is sodium hydroxide. This is a strong base. The formula of baking soda is Na(HCO3). This is a weak base. To prove that this is true, dissolve a spoonful of baking soda in a glass of vinegar. The following equation will occur.

    HC2H3O2 + NaHCO3 → NaC2H3O2 + CO2 + H2O

    The vinegar will neutralize the baking soda. This is an example of weak acid reacting with a base. I hope some of this is helpful for you.

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  • Mark
    Lv 7
    6 months ago

    Drain Cleaner (very VERY alkaline)

    Baking Soda (alkaline, but not so much that you have to wear gloves to touch it)

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  • Robin
    Lv 7
    6 months ago

    drain cleaner and baking soda as they are both hydroxides

    • pisgahchemist
      Lv 7
      6 months agoReport

      Some drain cleaners are basic, but not all. Some contains sulfuric acid. Baking soda in NaHCO3 and is NOT a "hydroxide."

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  • Jim
    Lv 7
    6 months ago

    Bottom two choices.

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