Red cabbage contains a water-soluble pigment. In a highly acidic solution, the pigment turns bright red, and in a moderately acidic solution, it turns pinkish. In a highly basic solution, the pigment turns yellow, and in a moderately basic solution, it turns bluish.
A student makes a pH indicator from red cabbage that has a reddish-purple color with a pH of approximately 7. The student pours the same amount of the cabbage solution into each of four different beakers. He then adds a different household solution to each of the four beakers until a color change is obtained. His results are shown in the table below.
The student finds the following chart online from someone else’s cabbage pH indicator investigation.
Based on the information in the passage, which household solution has the highest pH?
a
drain cleaner
b
lemon juice
c
window cleaner
d
club soda
The household solution with the highest pH would be drain cleaner.
Based on the information provided, the solution that turns the cabbage indicator yellow (indicating a highly basic or high pH solution) would have the highest pH. According to the results shown in the table, the cabbage solution turned yellow with the window cleaner solution. Therefore, the answer is c) window cleaner.
To determine which household solution has the highest pH based on the information given, we need to observe the color changes of the cabbage indicator when added to each solution.
According to the passage, red cabbage contains a water-soluble pigment that changes color based on the acidity or alkalinity of the solution it is in. In a highly acidic solution, the pigment turns bright red, while in a moderately acidic solution, it turns pinkish. In a highly basic solution, the pigment turns yellow, and in a moderately basic solution, it turns bluish.
The student pours the same amount of the cabbage solution into four different beakers and adds a different household solution to each beaker until a color change is obtained. The color changes can indicate the acidity or alkalinity of the household solution and help determine its pH.
To identify the household solution with the highest pH, we need to find the one that causes the cabbage indicator to turn the most bluish in color. Since a moderately basic solution turns the cabbage indicator bluish, the household solution that causes the cabbage indicator to turn bluish has the highest pH.
Looking at the chart provided, we can see that "Club soda" causes the cabbage indicator to turn bluish. Therefore, the household solution with the highest pH is "Club soda" (option d).