Lab Quiz On PH Reading Lab

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Station number: ________

Station number: ________ Description: ____________________________

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Description: ____________________________

Color of Red litmus paper: ______________ Color of Blue litmus paper: ______________

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Color of Red litmus paper: ______________

Color of Blue litmus paper: ______________

Color of pH paper: _______________

pH Reading (to 1 decimal place) : __________

Color of pH paper: _______________ pH Reading (to 1 decimal place) : __________

Answer the following questions.

1. Write the pH you got for the following solutions in the lab, DI water: pH = ___________ , 1.0M NaOH solution, pH = _________ . Circle the one that has a higher [H⁺] (hydronium ion Molarity/concentration)

2. Write the pH you got for the following solutions in this lab, 1.0M HCl. pH = ______ and 1.0M HC₂H₃O₂ (called acetic acid), pH = ___________
In the space below explain why they do not have the same pH even though they have the same Molarity (both 1.0M solutions).

3. Write the pH you got for the Tap water, pH = ____________. As you know, a container full of "just water molecules" actually have [H⁺] and [OH^1-] of 1.0E-7M thereby indicating that these ions exist with the water molecules (from the ionization of water). This is why people say pH of "just water" is 7.0. Since your pH reading is not 7.0, what does that tell you about what is in your water besides "just water molecules". Explain.

4. Write the pH you got for the 1.0M H₂SO₄ solution. pH = ________. In the space below, show all the calculations to determine the [H⁺] of this solution.

5. Please provide in the blanks below, the observations you obtained from one of the solutions in the lab.

Station number: ________    Description: ____________________________

Color of Red litmus paper: ______________   Color of Blue litmus paper: ______________

Color of pH paper: _______________   pH Reading (to 1 decimal place) : __________

On the back of this page, show all calculations to determine the pOH, [H⁺], and [OH^1-]. Circle each answers. Please remember to use units, sig fig and chemical formulas/symbols where appropriate.