Unit 5 Culminating Component
Scientific Terminology Inventory Probe – Acids & Bases
Read through the list of terms on the left-hand side. Place a check mark þ underneath the appropriate column based on your familiarity with that scientific term. If you know the term and can describe it, please write a description/definition in the space provided. At the end of the unit, return to this list and see where you’re at with your understanding of the terms.
|Scientific Term||I have never heard of this.||I have heard of this but I’m not sure what it means.||I have some idea of what it means.||I clearly know what it means and I can describe it!|
|net ionic equation|
|strong acid (or base)|
|weak acid (or base)|
Label the parts of the Titration apparatus below. Label the diagram (electronically or hand-written)
Define the following terms:
Prior Knowledge Questions
One way to determine if a solution is acidic or basic is to use
litmus paper, as shown to the right. There are two types of
litmus papers: red and blue.
How does litmus paper indicate an acid? ___________________________________________
How does litmus paper indicate a neutral substance? _________________________________
How does litmus paper indicate a base? ____________________________________________
Litmus is an example of an indicator, a substance that changes color depending on its pH (pH is a measure of the concentration of protons, or H+ ions). In the Titration Gizmo™, you will use indicators to show how acids are neutralized by bases, and vice versa.
To begin, check that 1.00 M NaOH is selected for the Burette, Mystery HBr is selected for the Flask, and Bromthymol blue is selected for the Indicator.
Acids and bases
|Get the Gizmo ready:
· Click Reset. Select 1.0 mol/L HNO3 for the Burette and Mystery NaOH for the Flask.
· Select Phenolphthalein for the Indicator.
· You will need a scientific calculator for this activity.
Introduction: When most acids dissolve in water, they dissociate into ions. For example, nitric acid (HNO3) dissociates into H+ and NO3– ions.
Question: How do acids and bases interact in solution?
Measure: A titration can be used to determine the concentration of an acid or base by measuring the amount of a solution with a known concentration, called the titrant, that reacts completely with a solution of unknown concentration, called the analyte. The point at which this occurs is called the equivalence point.
Carefully add HNO3 into the flask until the phenolphthalein begins to lose its color. Stop adding HNO3 when the color change is permanent.
Explore: Click Reset and change the indicator to Bromthymol blue. Add exactly 8.9 mL of HNO3 to the flask.
|Get the Gizmo ready:
· Click Reset. Select 1.00 mol/L NaOH for the Burette and Mystery H2SO4 for the Flask.
· Select Bromthymol blue for the Indicator.
Introduction: By using an appropriate indicator, a chemist can tell when a solution is neutralized by monitoring its color.
Question: How is titration used to determine an unknown concentration?
How much 1.00 mol/L NaOH is needed to neutralize the H2SO4 solution? _______________
Calculate the amount concentration (mol/L) of H2SO4 using stoichiometry. Use the GRASP method as shown in class to generate a complete response. You may handwrite your response (strongly suggested) and send a copy or type it electronically.
Click Calculate. What is the concentration listed? ___________________________
Click Check. Is this the correct concentration? ___________________________
If you get an error message, revise your work until you get a correct value. (You may have to redo the titration if you do not have the correct volume of titrant.) And compare your answer with #1.
In each experiment, write the balanced chemical equation.
Complete the table below by listing the volume of titrant needed to neutralize the analyte and then calculate the analyte concentration.
Use the Worksheet tab of the Gizmo to verify the calculation each analyte concentration. Include all units.
|Titrant||Analyte||Indicator||Titrant volume||Analyte concentration|
|0.70 mol/L KOH||HBr||Bromthymol blue|
|0.50 mol/L HCl||Ca(OH)2||Phenolphthalein|
|0.80 mol/L H2SO4||NaOH||Methyl orange|
Balanced Chemical Equations:
|· Using the inquiry data collected below, determine the concentration of the acids below.|
Table 1 Burette Readings for the Titration of Hydrochloric Acid with 0.1 M Sodium Hydroxide
|Reading (mL)||Trial 1||Trial 2||Trial 3|
Qualitative Analysis of Ions in a Solution
|· Investigate then qualitative properties of the solutions in the scenario below|
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