Lab: Measuring pH Answers
The photo on the right shows 12 solutions with cabbage indicator added. Answer these questions based on your cabbage indicator chart and the colors shown.In which order are the solutions arranged, from left to right?
Which is the best reason for using an Erlenmeyer flask instead of another piece of glassware while filtering the cabbage solution? The Erlenmeyer flask is the only container that can hold a liquid.The Erlenmeyer flask’s narrow mouth makes it easier to pour the solution.The Erlenmeyer flask’s narrow mouth can support the funnel and prevent breakage.The Erlenmeyer flask is the only glassware that will accommodate a filter funnel.
Why would you use a solution, such as a cabbage pH indicator, to measure the pH of household items?to see if food went badto test the safety of waterto make sure conditions are safeto use up old cabbage
Owning a swimming pool requires making sure that the pH of the pool water is between 7.0 and 7.6, because it is the optimal pH for .
Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.One solution turns blue. A possible hydrogen ion concentration for this solution is:1 × 10-2 M5 × 10-2 M5 × 10-4 M1 × 10-8 M
Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.The second solution turns purple. A possible hydrogen ion concentration for this solution is: 1 × 10-2 M7× 10-3 M1 × 10-7 M7 × 10-4 M
Using logarithms, you determined the [___] of 7 solutions ranging from strong acid to neutral to strong base.
Which method helped you prove this hypothesis? Check all that apply.Using various concentrations of HCl and NaOH to measure a range of pHUsing an existing scale to determine pHKnowing that the cabbage indicator always has the same color at a given pH value
[___] coffee, pH 5
Which factors might cause the pH of the water to change? Check all that apply.rainwater depthtemperature changewater filter
[___] baking soda solution, pH 9
You confirmed the pH values of the 7 sample solutions via the color of the pH indicator. You then used the known pH values to [___] the cabbage pH indicator scale’s colors.
What range seems to be missing?
[___] bleach, pH 13 (strong base)
[___] toothpaste, pH 8
[___] milk, pH 6.8
[___] battery acid, pH 1, (strong acid)
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