Acids and Bases - Labster Lab PDF

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Labster Lab...

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OL Lab 8: Acids and Bases Learning Objectives       

Give examples of acids and bases from everyday life Define pH and identify acids and bases using the pH scale Apply the Bronsted-Lowry definition of acids and bases to chemical compounds Describe the amphoteric and self-ionization capacity of water Calculate the pH of a strong acid and base in solution Assess whether a neutralization reaction will occur Evaluate the outcome of simple acid-base reactions

Introduction Have you ever consumed an acid or a base? Yes, you have! Acids and bases are found all around us: In the food we eat, the beverages we drink, many of the everyday household products at home and even inside us! In this virtual simulation, you will learn the fundamentals of acids and bases and go through some of the ways they can be characterized and used in the lab.

Acidic life How do acidic or alkaline foods affect the pH of our blood, and what does this even mean? Together with your lab assistant, Marie, you will explore different concepts of acids and bases, and investigate how alkaline foods can also contain acids. You will measure the pH of solutions, and dive into these to experience what happens at the molecular level.

Salty mixtures In order to determine what reactions occur when you mix acids and bases of different strengths, you will have the freedom to mix these solutions and interpret the resulting salt products. And don’t worry if you make mistakes – in this virtual lab, you can just reset and start over! On-the-go quizzes will make sure you are up to speed, and you can always dive into the theory pages for more in-depth explanations.

Corrosive everyday chemicals Acids and bases can be corrosive and very dangerous to handle. But they also play a fundamental role in all living things, in nature, and in the chemical industry. Will you be able to measure the acidity of various substances around you?

Part 1: Complete the Labster lab: Acids and Bases Part 2: Report and Reflection

Purpose: Describe in complete sentences and in your own words, the purpose of this experiment. Getting formular with acidic or basic things. Knowing the pH levels of everyday items or just in certain substances. Working with mix acids and bases to find the ph levels and or the moles.

Observations: Record three observations from the simulation. o The base contacts with acids & remove the protons o Dispersion, dissocation, and ionation are three ways substances disovle in water. o “-ic acid” form oxygen containging acids Answer the questions below 1. In your own words, describe how to determine which substance acts an acid and which substance acts as a base in the forward direction of the following reaction:

H2S + H2O ⇌ H3O+ + HSH2O +H2S ⇌ H3O++HSBrønsted–Lowry theory,al s oc al l edpr ot ont heor yofac i dsandbas es ,at heor y , s t at i ngt hatanyc ompoundt hatc antransfer a proton t oanyot herc ompoundi s anacid,andt hec ompoundt hataccepts t heproton i sabase. H2O ac cept spr ot onbecomesH3O+.SoH2O is a base H2St r ans f er sapr ot onbec omesHS-.SoH2S is an acid

2. Predict the two products of the following neutralization reaction and label each product using acid/base terminology: HCl + RbOH →

Neutralization reactions oc curwhent wor eac t ant s ,anacid and abase,c ombi net of or mt hepr oduc t ssalt &water. I nabov eneut r al i z at i onr eact i on,t hepr oduc t sf or medar eRubi di um c hl or i desalt andWater. Acid  which gives H+ in water Base -- gives OH- in water HCl Acid RbOH---base RbCl salt

3. In your own words, describe the relationship between proton (H +) concentration, and pH. (2 points) pHi sdefinedast hedeci mall ogar i t hm oft her eci pr ocaloft hehydr ogeni onact i vi t y ,aH+,i na sol ut i on.

Thi si sbecauset hef or mul ausedt ocal cul at epHappr oxi mat est henegat i veoft hebase10 l ogar i t hm oft hemol arconcent r at i onofhydr ogeni onsi nt hesol ut i on. Mor epr eci sel y ,pHi st henegat i veoft hebase10l ogar i t hm oft heact i vi t yoft hehydr ogeni on.

4. Reflection: Consider what you learned from this simulation. Reflect on three to four key concepts that you learned in this lab exercise. How could the lessons learned in this virtual lab related to a real world situation in the community/world or your future career? Be specific in your answer (this should require 5-10 sentences).

Acids and bases are also essential for life. For example, without the strong acid present in our stomachs, we would not be able to digest food. More importantly, an organism needs to be able to control the level of acid within its cells for life to be possible. The world’s oceans are able to sustain life in part because the level of acid (or pH) of the water is kept constant through acid–base chemistry. In the same way, the pH of living cells is tightly regulated to allow cells to maintain their structural integrity, and for cellular processes to function. To keep living cells or body fluids at the proper pH, special compounds called buffers are used.

Grading Rubric:

Activity

Deliverable

Points

Labster Lab

Complete simulation and answer all questions

9

Document Submission Complete lab report and answer questions    

Total

9

Observation (3 points) Purpose (1 point) Questions (3 points) Reflection (2 points)

Complete all lab activities

18...