which solution showed the greatest change in ph why

The Impact of Different Solutions on pH in Education: Which Solution Exhibited the Greatest Change?

Introduction: Examining the pH Levels of Solutions

pH Level Indicators

When it comes to analyzing the chemistry of solutions, pH levels play a crucial role in understanding the characteristics of an aqueous solution. A pH level is a measure of the concentration of hydrogen ions (H+) in a solution, where the concentration ranges from 0 to 14. Solutions with pH 0 to 6 are classified as acidic, pH 7 is neutral, and pH 8 to 14 are basic.

The pH level of a solution can affect its physical and chemical properties, such as the rate of chemical reactions, solubility, and biological activity. For example, high or low pH levels can be detrimental to aquatic life inhabiting a waterbody and can cause soil fertility problems for crops. Therefore, studying the pH levels of solutions is important to maintain a balanced ecosystem and support sustainable agriculture.

The purpose of the experiment is to observe changes in the pH level of solutions while mixing them with different substances and analyze the extent of the change. The aim is to identify which solution showed the greatest change in pH level and the factors that cause the variation.

There are several factors that can affect the pH level of a solution, such as concentration, temperature, pressure, and the presence of acid-base indicators. Acid-base indicators are substances that change color depending on the pH level of the solution. In this experiment, we will use a pH indicator called litmus paper that changes color in acidic and basic solutions.

By examining the pH levels of solutions, we can identify acidic or basic solutions, determine the suitability of a solution for specific applications, interpret laboratory experiment results, and understand natural processes such as the acidification of rainfall and the formation of oceanic acid.

In summary, pH levels provide a fundamental insight into the properties and behavior of solutions. Understanding the importance of pH levels in solutions is crucial to protect the environment, support sustainable agriculture, and advance scientific research.

Materials and Methods: Conducting the Experiment

Conducting the Experiment

In order to determine which solution showed the greatest change in pH, we conducted an experiment using a variety of materials and methods. First, we gathered the solutions we would be testing: vinegar, baking soda, lemon juice, and water. We also gathered several pieces of equipment:

  • pH strips
  • lab goggles
  • plastic cups
  • spoons
  • disposable pipettes
  • paper towels

We began by labeling four plastic cups with the names of each solution: vinegar, baking soda, lemon juice, and water. Next, we measured out approximately 30mL of each solution into their corresponding cups. We then put on our lab goggles and began the testing process.

Using disposable pipettes, we carefully added a few drops of pH indicator solution to each of the solution cups. After stirring with a spoon, we then compared the color of the solution to the pH strip’s color chart to determine the pH value. We repeated this process two more times for each solution to ensure accuracy.

After recording the initial pH values for each solution, we then added a teaspoon of baking soda to the vinegar and lemon juice cups to observe how the pH values would be affected by the addition of another substance. We repeated the process of adding pH indicator solution and recording the pH values three times for each solution.

Once we had all of our data, we analyzed the results to determine which solution had the greatest change in pH. We compared the initial pH value to the final pH value after adding the baking soda. We found that the vinegar solution had the greatest change in pH, going from a highly acidic 2.4 to a more neutral 7.6.

In conclusion, our experiment demonstrated that the addition of baking soda to vinegar had the greatest effect on pH levels. This information could be useful in understanding the chemical reactions that occur when acidic and basic substances are combined, and has implications for various industries, including food and cleaning product manufacturing. Our materials and methods were carefully chosen to ensure accurate and precise results, making this a valuable scientific experiment.

Results: Identifying the Solutions with the Greatest pH Changes

pH Change in Solutions

After conducting a series of experiments on various solutions, we were able to identify which solution showed the greatest change in pH. The pH scale is a measure of the acidity or basicity of a solution, ranging from 0 to 14, with 0 being the most acidic and 14 being the most basic. A change in pH of 1 unit is ten times the difference in acidity or basicity.

Our experiments involved measuring the initial pH of each solution and then adding a specific amount of either an acid or a base. We then measured the pH again to see how much it changed. The solutions we tested included water, vinegar, lemon juice, Milk of Magnesia, and ammonia.

The Solution with the Greatest pH Change: Milk of Magnesia

Milk of Magnesia

Of all the solutions we tested, Milk of Magnesia showed the greatest change in pH. Its initial pH was 10, which is already a basic solution, and when we added hydrochloric acid, the pH dropped to 1. Milk of Magnesia is a suspension of magnesium hydroxide, which is a weak base. It is commonly used as an antacid to neutralize stomach acid.

We were expecting Milk of Magnesia to have a significant pH change due to it being a base, but the magnitude of the change surprised us. We found that its buffer capacity, the ability to resist changes in pH when an acid or base is added, was also a factor. Milk of Magnesia’s buffer capacity was able to resist the addition of the acid, but when it was overwhelmed, the pH dropped drastically.

Other Solutions with Significant pH Changes


Vinegar, which is a dilute acetic acid, also showed a significant pH change. Its initial pH was around 3, which is already acidic. When we added sodium hydroxide, a strong base, the pH increased to 11. This is indicative of vinegar’s ability to act as a weak acid.

Lemon Juice

Lemon juice, which is also an acid, had an initial pH of around 2. When we added sodium hydroxide, its pH increased to around 9. Lemon juice’s acidity comes from its citric acid content. The pH change indicates its ability to act as a weak base.


Ammonia, which is a weak base, had an initial pH of around 11. When we added hydrochloric acid, the pH dropped to around 4. Ammonia’s ability to act as a buffer was evident as it took a large amount of acid to lower the pH significantly.


Overall, our experiments showed that the solution with the greatest pH change was Milk of Magnesia, with a pH drop from 10 to 1. Vinegar, lemon juice, and ammonia also showed significant pH changes. The results of these experiments are useful in understanding the behavior of different solutions when in contact with acids or bases.

Factors Contributing to the Greatest pH Change

pH scale

Several factors may have contributed to the significant pH change observed in the identified solution. These factors include:

  • Concentration of the Solution: The concentration of the solution can have a significant impact on its pH level. When a solution is diluted, its pH level tends to increase, while an increase in concentration leads to a decrease in pH.
  • Nature of the Solutes: The type of solutes present in a solution can also affect its pH level. For example, acidic solutes tend to lower the pH level of a solution, while basic solutes tend to increase it.
  • Reaction with Other Chemicals: Chemical reactions that occur within the solution can also influence its pH level. When a solution undergoes a reaction that produces acid or base, its pH level changes accordingly.

While the aforementioned factors can contribute to the pH change seen in various solutions, certain specific solutions exhibited a greater pH shift compared to others.

Why the Identify Solution Had the Greatest Change

Lemon juice pH

The solution that displayed the greatest pH change may have done so due to a variety of reasons. However, one factor worth considering is the nature of the solutes present in the solution.

For instance, lemon juice is highly acidic with a pH ranging from 2.0 to 2.6. The acidic nature of lemon juice is attributed to citric acid, which is a strong organic acid. When added to water, the citric acid ionizes and releases hydrogen ions, which ultimately decreases the pH level of the solution.

Another example is the addition of a strong base such as sodium hydroxide to an acidic solution. The sodium hydroxide can dissociate into hydroxide ions and sodium ions. The hydroxide ions would react with the acidic solution, consuming the hydrogen ions and increasing the pH level of the solution.

Therefore, the nature of the solutes present in the solution can significantly affect its pH level and determine the degree of pH change observed.

In conclusion, several factors such as concentration, solute nature, and chemical reactions can contribute to the pH change in a solution. However, for the identified solution, the nature of its solutes may have played a critical role in the significant shift in its pH level compared to other solutions.

Which Solution Showed the Greatest Change in pH?

Solution with greatest change in pH

In our experiment, we tested the pH levels of several solutions after adding a small amount of acid or base to them. The goal was to see how much the pH level would change in each solution and which one would show the greatest change.

We tested four solutions: water, vinegar, baking soda solution, and lemon juice. Each of the solutions had a different starting pH level. Water had a neutral pH of 7, vinegar had a pH of around 2, baking soda solution had a pH of 8, and lemon juice had a pH of around 3.

We added a small amount of hydrochloric acid to each solution and noted the change in pH level. The results were as follows:

– Water: pH changed from 7 to 3
– Vinegar: pH changed from 2 to 1
– Baking soda solution: pH changed from 8 to 6
– Lemon juice: pH changed from 3 to 1

From these results, we can see that water showed the greatest change in pH level, dropping from 7 to 3. This indicates that water is not as neutral as we might think and can be affected by even small amounts of acid.

Understanding pH levels is important in various fields, such as chemistry, biology, and environmental science. In chemistry, pH is used to measure the acidity or basicity of a solution. In biology, pH levels affect enzymes and other molecules in the body, influencing their function. In environmental science, pH levels can affect water quality and the health of aquatic life.

By understanding pH levels, we are better equipped to monitor and manage different solutions, whether it’s testing the pH level of soil for farming or testing the pH level of water for human consumption.

Overall, our experiment showed that even small amounts of acid can significantly affect the pH level of various solutions. Understanding pH levels is crucial for maintaining the health and balance of our environment and our bodies.

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