Question

Dispose of all materials according to your teacher's directions. Data record your data in your lab notebook or in the space below. Table A: Control solutions (in order from most acidic to most basic) Solution Name pH using -log [H+] Indicator Paper Color Indicator pH Range (low-high) Table B: Cabbage pH indicator key pH Range (low-high) 1-2 3-4 5-6 7 8-9 10-11 12-13 Cabbage Solution Indicator Table C: Test solutions Lemon Juice Hand Sanitizer Soap/Dishwashing Liquid Predicted pH Cabbage Indicator Color pH Range (low-high) Acidic, Basic, or Neutral

Answer 1

Chemistry labs utilize pH paper and various indicators like phenolphthalein to estimate the pH of solutions; pH paper changes color according to pH levels, and the pH scale measures solution acidity or basicity.

Step-by-step explanation:

The use of pH paper and indicators, such as universal indicators and phenolphthalein, is a common practice in chemistry labs to estimate the pH of a solution. The pH scale, which ranges from 1 to 14, measures the acidity or basicity of a solution. A low pH indicates a high concentration of hydrogen ions and is considered acidic, while a high pH indicates a low concentration of hydrogen ions and is basic. The pH paper contains a mixture of indicators that change color at different pH levels, which makes it possible to determine the pH range by simply comparing the paper's color to a standard chart. Phenolphthalein, on the other hand, is a pH indicator that becomes pink at a pH level around 9 to 10, signaling a slightly basic solution.