What will neutralize acid

If this happens, try adding one or more drops of citric acid until the color is close to neutral. Be sure to keep track of the total number of drops of acid and base you add. Expected Results With each drop of sodium carbonate, the citric acid solution will move toward neutral, eventually becoming green.

Table 1. How many drops of sodium carbonate does it take to neutralize your citric acid solution? Acidic solution Number of drops of citric acid solution added to the indicator Number of drops of sodium carbonate solution needed to neutralize the citric acid solution First citric acid solution 3 drops Second citric acid solution Discuss student observations.

How many drops of sodium carbonate did it take to bring the color back to the color of the control? Results will vary but it should take fewer drops of sodium carbonate than drops of citric acid to neutralize the solution. Does the solution become more acidic or less acidic as each drop of sodium carbonate is added to the indicator? The solution becomes less acidic. How do you use the color of the control to help you neutralize an acid? When the color of the universal indicator solution becomes near green, the acidic solution has been neutralized.

Project the animation Neutralizing an Acidic Solution. Explore Have students compare how many more drops of a base it takes to neutralize a more concentrated acidic solution. Question to Investigate How many more drops of sodium carbonate solution will it take to neutralize a more concentrated citric acid solution? Materials for Each Group Citric acid Citric acid solution Sodium carbonate solution Universal indicator solution 2 flat toothpicks 3 droppers Spot plate Neutralize a citric acid solution Use a flat toothpick to add two scoops of citric acid to your citric acid solution to make it even more acidic.

Add universal indicator solution to a clean well in the spot plate. Add 3 drops of the more concentrated citric acid solution to the indicator and stir with a clean toothpick. Ask students: Do you think it will take more, less, or the same amount of sodium carbonate solution to neutralize this more concentrated citric acid solution? It will take more drops of the base to neutralize the more concentrated citric acid solution. Thinking about the animation, why will you need more drops of sodium carbonate solution?

So it takes more molecules of the base to accept the extra protons and move more toward neutral. Neutralize a more concentrated citric acid solution Add single drops of sodium carbonate solution to the same well in which you added the acid. Extend Have students neutralize two basic solutions to determine which is most concentrated.

Materials for each group Universal indicator solution Citric acid solution Solution A Solution B At least 6 toothpicks Spot plate 3 droppers Teacher Preparation Make two mystery solutions using different amounts of sodium carbonate. Label two cups Solution A and Solution B for each group. Make a class set of solutions A and B. Solution A: 50 mL of water and 5 toothpicks of sodium carbonate Solution B: 50 mL of water and 10 toothpicks of sodium carbonate Place about 5 mL of each solution in their labeled cups.

Ask students: Solutions A and B are both basic solutions made with sodium carbonate and water. One of these solutions has more sodium carbonate than the other. How can you figure out which solution is more concentrated? Students should describe a procedure very similar to the one they used to neutralize the two citric acid solutions.

They should suggest that they neutralize each sodium carbonate solution with drops of citric acid and count how many drops it takes to neutralize each solution.

When the color of the solution is close to the color of the control, the solution is neutralized. How will you know which solution is the most concentrated? The solution that requires the greatest number of drops of citric acid to become neutral is the most basic. Discuss what students will do: For best results, have students place 2 drops of Solution A in one well filled with indicator solution and 2 drops of Solution B in another well filled with indicator solution.

Then they should add single drops of citric acid solution, stir, and compare the color to the color of the control. Students should keep track of the number of drops of citric acid it takes to neutralize each solution. Procedure Add universal indicator solution to three wells in a clean spot plate. Add 2 drops of Solution B to the third well.

Neutralize Solution A. Record the number of drops used in the chart. Neutralize Solution B. How to Dilute Acid. How to Dispose of Hydrochloric Acid. How to Neutralize Muriatic Acid. How to Use Lye Safely. How to Clean Lab Equipment.

How to Make Flash Paper. Hydrochloric Acid Safety Precautions. What Turns pH Paper Green? The best way to measure this is to take the pH of the solution using pH paper, chemical indicators, or pH meters. Chemicals with a pH of 7 are considered neutral acids and typically have a pH less than 7. To neutralize them, use a weak base.

There are two types of acids: mineral inorganic acids—such as sulfuric, hydrochloric, or nitric—and carboxylic organic acids such as formic or acetic. He brings expertise in the mechanical and chemical industries, as well as science, technology and environmental topics. Kumar holds a diploma in creative writing from Bharathiyar University and a diploma in mechanical engineering from the Department of Technical Education in India. Things You'll Need. Disposal of Boric Acid. The Properties of Acidic Substances.

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