Students learn about acids and bases and demonstrate how plant extracts can be used as indicators.
Students devise a scientific investigation to detect acids and bases in common materials. Students will prepare a test solution whose color changes when an acid or base is added.
In this activity, students will use a chemical reaction to test for the presence of carbonate in calcite and limestone. Students will drop a small amount of acid on mineral specimens and observe the bubbles of carbon dioxide forming from the reaction of the acid with carbonite minerals.
This worksheet provides practice problems for computation of [H+] and [OH-].
In this lab activity, students will test the pH of a number of common substances.
This worksheet provides practice problems for computation of [H+] and [OH-].
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In this lab activity, students will test household chemicals with litmus paper and using red-cabbage juice inidcator and use the results to classify household substances as acids or bases.
In this lab activity, students will investigate chemical changes that occur when acids and bases react. It is meant to introduce the concepts of chemical changes, mass of gases, conservation of mass, and balancing equations. Students will make qualitative observations and quantitative measurements.
The student will use purple cabbage indicator to test five know substances for acidic/alkaline balance. The student will discuss the safety precautions required both inside and outside a lab in handling acids and bases.
This experiment can be a student-led experiment or teacher demonstration. In this experiment students will add powder or finely-divided metal to hychloric acid and measure temperature changes.
In this inquiry-based lab activity, students choose from several different fruits and vegetable and asked to determine whether they could be used to make an acid-base indicator.
In this chemistry lab activity, students will apply what they learned from titrating and graphing a strong acid (HCl) with a strong base (NaOH) to a titration involving a strong base and a weak acid. Before performing the titration students will be asked to predict how the end point of the titration will shift. They will collect data and graph it in the same way they did in the earlier titration, determine the end point, and note how it shifted. Finally they will be asked to apply their understanding of the definitions of "strong" and "weak" as applied to acids and bases to explain the observed shift. Students will produce an informal lab report that includes a prediction, data table, graph, and analysis.
In this lab activity, students use red-cabbage extract as an acid-base indicator.
In this lab activity, students demonstrate a neutralization reaction using cotton swabs, lemon juice, liquid soap and goldenrod copy paper. The paper acts as an indicator for the neutralization reaction.
The experiment is in two parts. The first part involves boiling some red cabbage in water. In the second part the students test their indicator. Between the two parts the mixture must be allowed to cool. The first part takes about 10 to 15 minutes. The cooling takes about 15 minutes and the testing less than 5 minutes.
In this experiment students will test various substances with indicator solution and looking for colour changes.
Students use a volume of dilute hydrochloric acid that models the volume and concentration of our stomach contents. They will then add typical doses of a range of over-the-counter antacid preparations - powders, tablets and liquids and monitor the changing pH with either Universal indicator solution or a pH probe. Students will compare the effects of different preparations and discuss the short and long-term consequences of using each medicine.
In this unit students will learn what ocean acidification is and why it is happening, describe ways in which individual species and marine ecosystems might respond to ocean acidification, and describe how ocean acidification will impact the ability of oceans to sequester carbon.
In activity Part A, students will analyze a time-series graph to search for relationships between trends in atmospheric CO2, dissolved CO2 in seawater, and changes in ocean pH. Then, they will carry out a class experiment on the effects of increased amounts of CO2 on pH in sea water. This activity also focuses on understanding pH and ocean acidity. Included is a short interactive video about acids, bases, pH, and ions.