Introduction to Acids & Bases: A WebQuest



Introduction to Acids & Bases: A WebQuest

1.

The word acid comes from the Latin word _____________________ meaning __________________.

Boyle stated that acids taste ___________________, are corrosive to _____________________, change the color of litmus to _______________,and become less acidic when mixed with _______________.

He described bases as feeling ________________________, changing litmus to the color ______________, and becoming less basic when mixed with an ___________.

About 200 years later, Arrhenius proposed that water can dissolve many compounds by separating them into their individual _____________. He suggested that acids contain _____________ and can dissolve in water to release _________________.

Bases dissolve in water to release _______________________ ions into the solution.

2.

Every liquid has __________ & ____________ traits. One exception might be __________________________. It is just water. However, the ____________ ions and _________________ ions cancel each other out.

3.

Give the formula for the following acids:

Hydrofluoric Acid-

Hydrochloric Acid-

Hydrosulfuric Acid-

Nitric Acid-

Sulfuric Acid-

Acetic Acid-

Boric Acid-

Give the formula for the following bases:

Sodium Hydroxide-

Potassium Hydroxide-

Calcium Hydroxide-

Iron (II) Hydroxide-

4.

Scroll down to Properties of Acids.

Complete the following sentences for Acids

← Tastes _________________

← Changes litmus from blue to _____________.

← Solutions are __________________________ (conduct electricity).

← React with bases to form ___________________ + _______________. Neutralization

← Create _______________ gas when reacting with an active metal.

← Five (5) Common acids (scroll down):

Properties of Bases

← Tastes _____________________.

← Feels _______________________________.

← Don’t change the color of __________________________.

← Solutions are _____________________________ (conduct electricity).

← React with acids to form ____________________ + ______________________. Neutralization

← Four (4) Common Bases:

5. and



Scroll down on the site above until you get to the pH scale

Using the sites above, answer the questions below:

A. pH range of acids ______________________

B. pH of a neutral substance ______________

C. pH of a basic (alkaline) substance ______________________

Use information from the sites above and list the following substances according to pH. The lowest pH should be listed first and the highest base listed last. HCl and NaOH are given as examples.

Substances: Correct Acid-Base pH list

Pure water 1 HCl

Apples

Ammonia

Lime (Calcium Hydroxide)

Milk

HCl

Vinegar

Baking Soda

NaOH

Human Blood

Lemon juice

Battery Acid

Milk of Magnesia

Rain water

Egg whites

Drano 14 NaOH

6.

Take the quiz.

Place score here __________________.

7.

Take the quiz.

Place score here ____________________.

Use this link to answer the following questions:



1.) Rain that has a very low pH is called ____________________________ .

2.) Natural rainwater has a pH of ______________ .

3.) Sulfur dioxide reacts with atmospheric oxygen to form ______________ .

4.) Name the two acids in pollution that make rain acidic: _____________________ .

5.) Fish in a lake will die if the pH drops below _____________ .

Use this link to answer the following questions:



6.) A titration is the ___________________________________________________ .

7.) The solution of known concentration is called the _________________________ .

8.) The initial volume is read from the bottom of the _________________________ .

9.) The equivalence point of a titration is when______________________________ .

10.) The course of the reaction during a titration can be followed by plotting the pH on a _________________________________ .

11.) The pH of the solution at the equivalence point is determined by ________________________________________ .

12.) What is an indicator? ______________________________________________ .

13.) What color is methyl red at pH = 8? ______________ .

14.) In acidic solutions ________________________ is colorless.

15.) When base is added, phenolphthalein will remain colorless until the pH = _____ .

16.) At the equivalence point of the titration, the color of the solution will be __________ .

Use this link to answer the following questions:

1.

In the chart provided list the pH of the substance in each test tube.

Substance pH

1.

2.

3.

4.

5.

Use this link to answer the following questions:



This website lets you look at the ph scale and indicators. Complete the following for the first

part of the website. The other two parts work through them and write a one paragraph

summary on the task you completed.

Task 1: Litmus Reaction.

Complete the chart that corresponds with the activity.

|Substance |Prediction |Test |

|Vinegar | | |

|Water | | |

|Baking Powder | | |

|Alka Seltzer | | |

|Cola | | |

|Lemon Juice | | |

|Tea | | |

|Oven Cleaner | | |

|Battery Acid | | |

2: Universal Indicator

Complete the chart that corresponds with the activity.

|Substance |Prediction |Test |

|Vinegar | | |

|Water | | |

|Baking Powder | | |

|Alka Seltzer | | |

|Cola | | |

|Lemon Juice | | |

|Tea | | |

|Oven Cleaner | | |

|Battery Acid | | |

3: Neutralization

Summarize the activity in the space provided below. What did you learn from this particular

activity? Write your observations in the space provided below.

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download