Acids And Bases Test
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Tuesday, May 26, 2009
Friday, May 22, 2009
Friday May 22nd
All we did today was go over chapter 19 study guide. We had approximately twenty minutes to work on it in class, and then Mrs. k went over it. The study guide is composed of acid and bases questions, which is basically the review for our upcoming test.
For people who are looking for the study guide answers do not worry, Mrs k will upload soon enough on the blog .
Test on Monday 25, so use your weekend wisely and hopefully you'll ace the test.
Next scribe is.... is ..... Yassir
For people who are looking for the study guide answers do not worry, Mrs k will upload soon enough on the blog .
Test on Monday 25, so use your weekend wisely and hopefully you'll ace the test.
Next scribe is.... is ..... Yassir
Thursday, May 21, 2009
ACID AND BASES
HEY EVERYONE!
PROPERTIES OF ACIDS
Corrosive ('burns' your skin)
Sour taste (e.g. lemons, vinegar)
Contains hydrogen ions (H+) when dissolved in water
Has a pH less than 7
Turns blue litmus paper to a red colour
Reacts with bases to form salt and water
Reacts with metals to form hydrogen gas
Reacts with carbonates to form carbon dioxide, water and a salt
EXAMPLES OF ACIDS
Hydrochloric acid (HCl) in gastric juice
Sulphuric acid (H2SO4)
Nitric acid (HNO3)
Carbonic acid in softdrink (H2CO3)
Uric acid in urine
Ascorbic acid (Vitamin C) in fruit
Citric acid in oranges and lemons
Acetic acid in vinegar
Tannic acid (in tea and wine)
Tartaric acid (in grapes)
PROPERTIES OF BASES
Corrosive ('burns' your skin)
Soapy feel
Has a pH more than 7
Turns red litmus paper to a blue colour
Many alkalis (soluble bases) contain hydroxyl ions (OH-)
Reacts with acids to form salt and water
EXAMPLES OF BASES
Sodium hydroxide (NaOH) or caustic soda
Calcium hydroxide ( Ca(OH)2 ) or limewater
Ammonium hydroxide (NH4OH) or ammonia water
Magnesium hydroxide ( Mg(OH)2 ) or milk of magnesia
Many bleaches, soaps, toothpastes and cleaning agents
PROPERTIES OF ACIDS
Corrosive ('burns' your skin)
Sour taste (e.g. lemons, vinegar)
Contains hydrogen ions (H+) when dissolved in water
Has a pH less than 7
Turns blue litmus paper to a red colour
Reacts with bases to form salt and water
Reacts with metals to form hydrogen gas
Reacts with carbonates to form carbon dioxide, water and a salt
EXAMPLES OF ACIDS
Hydrochloric acid (HCl) in gastric juice
Sulphuric acid (H2SO4)
Nitric acid (HNO3)
Carbonic acid in softdrink (H2CO3)
Uric acid in urine
Ascorbic acid (Vitamin C) in fruit
Citric acid in oranges and lemons
Acetic acid in vinegar
Tannic acid (in tea and wine)
Tartaric acid (in grapes)
PROPERTIES OF BASES
Corrosive ('burns' your skin)
Soapy feel
Has a pH more than 7
Turns red litmus paper to a blue colour
Many alkalis (soluble bases) contain hydroxyl ions (OH-)
Reacts with acids to form salt and water
EXAMPLES OF BASES
Sodium hydroxide (NaOH) or caustic soda
Calcium hydroxide ( Ca(OH)2 ) or limewater
Ammonium hydroxide (NH4OH) or ammonia water
Magnesium hydroxide ( Mg(OH)2 ) or milk of magnesia
Many bleaches, soaps, toothpastes and cleaning agents
Acid and Base Assignment of Titration
hey everyone,
in today's class we Mrs.K went over the assignment that she handed yesterday and after we finished correcting this assignment. Mrs.K handed out study guide for Acid and Bases,which means that we have test on Monday if we make it. for those of us who want to get (A+) you have to study every hard my friend. I am sorry if I didn't blog enough information to the blog, because I forgot my binder.Good luck everybody.
next scribber is Yonas.
Wednesday, May 13, 2009
wednesday may 13
Hi, this is Robel. My first time blogging and i'll try to make it as exciting as possible. As usual Mrs. k began teaching the second we got into class. She went over questions Acid-Base work sheet 4 numbers 1 -4. She did several examples of percent dissociation. And finally she told us to do questions 5 - 15 for people who want to get an "A" on the next week's test.
Next scribe is Ahmed
Next scribe is Ahmed
pH and pOH
Today, we learned more about the pH and pOH.
pH can be defined as the negative logarithm of the hydronium ion concentration, or
pH=-log[H3O]
pOH can be defined as the negative logarithm of the hydroxide ion concentration, or
pH=-log[OH]
remember: pH + pOH = 14.
to learn more about the calculations with pH and pOH, ms. K went over Acid-Base Assignment #6 , numbers 1-4. The answers for these problems are posted below this post.
After going over the calculations for this problems, ms. K handed us RELATIVE STRENGTHS OF ACIDS and ACID DISSOCIATION CONSTANT. On the second worksheet we learned the difference between Ka and Kb.
Ka is the acid dissociation constant or ionization constant. The larger the Ka, the stronger the acid and therefore there's more product and thats there's greater dissociation. The smaller the Ka, the less the product and therefore weaker acid.
Kb is the base dissociation constant. It reflects the strength of a base. the higher the base, the higher the value of Kb will be.
We also went over how to CALCULATE THE DISSOCIATION CONSTANT. Its almost the same as how to calculate the equilibrium constant, by setting up an ic table. Also, Ka and Kb has no units, just like Kc.
LAB IS DUE TODAY.
the next scribe is LARLYN:))
pH can be defined as the negative logarithm of the hydronium ion concentration, or
pH=-log[H3O]
pOH can be defined as the negative logarithm of the hydroxide ion concentration, or
pH=-log[OH]
remember: pH + pOH = 14.
to learn more about the calculations with pH and pOH, ms. K went over Acid-Base Assignment #6 , numbers 1-4. The answers for these problems are posted below this post.
After going over the calculations for this problems, ms. K handed us RELATIVE STRENGTHS OF ACIDS and ACID DISSOCIATION CONSTANT. On the second worksheet we learned the difference between Ka and Kb.
Ka is the acid dissociation constant or ionization constant. The larger the Ka, the stronger the acid and therefore there's more product and thats there's greater dissociation. The smaller the Ka, the less the product and therefore weaker acid.
Kb is the base dissociation constant. It reflects the strength of a base. the higher the base, the higher the value of Kb will be.
We also went over how to CALCULATE THE DISSOCIATION CONSTANT. Its almost the same as how to calculate the equilibrium constant, by setting up an ic table. Also, Ka and Kb has no units, just like Kc.
LAB IS DUE TODAY.
the next scribe is LARLYN:))
Tuesday, May 12, 2009
Monday, May 11, 2009
Indicators and pH Lab
Today, we learned/recalled that we can determine the acidity or alkalinity of an aqueous solution by different indicators.
1. The pH meter - It is an electronic device that shows a numerical value of how acidic or basic a solution is. It is accurate and fast, but is also relatively expensive.
2. The Indicator Paper - It is an ordinary filter paper that changes colour when the concentration of hydrogen ions reach a certain level.
3. The Indicator Solutions - The different indicator solutions change colour at a specific pH.
We also had a lab today. It is the prettiest lab that we did and will do, as Mrs. Kozoriz noted. (And yes, it really turned out beautiful!) We placed 10 drops of distilled water in column numbers 2-11 and added either HCl or NaOH to the rows. And then, using the indicator solutions that were provided to us, we witnessed the transformation of colours in each of the wells of our well plates.
After the fun, we had four questions to answer:
1. What is the significance of the colour changes in each row?
2. Which would be a good indicator for general use?
3. Which would be a good indicator for a HCl/NaOH titration?
4. Which would be a poor indicator for a HCl/NaOH titration? Why?
Labs are due tomorrow! I choose Marie as the next scribe :)
1. The pH meter - It is an electronic device that shows a numerical value of how acidic or basic a solution is. It is accurate and fast, but is also relatively expensive.
2. The Indicator Paper - It is an ordinary filter paper that changes colour when the concentration of hydrogen ions reach a certain level.
3. The Indicator Solutions - The different indicator solutions change colour at a specific pH.
We also had a lab today. It is the prettiest lab that we did and will do, as Mrs. Kozoriz noted. (And yes, it really turned out beautiful!) We placed 10 drops of distilled water in column numbers 2-11 and added either HCl or NaOH to the rows. And then, using the indicator solutions that were provided to us, we witnessed the transformation of colours in each of the wells of our well plates.
After the fun, we had four questions to answer:
1. What is the significance of the colour changes in each row?
2. Which would be a good indicator for general use?
3. Which would be a good indicator for a HCl/NaOH titration?
4. Which would be a poor indicator for a HCl/NaOH titration? Why?
Labs are due tomorrow! I choose Marie as the next scribe :)
Thursday, May 7, 2009
Wednesday, May 6, 2009
May 5 - Tony Nguyen
Seeing how no one is posting for yesterday, I'm taking advantage of it by saying we had a mini test worth 20 marks based on chemical equlibria that I totally bombed. We also had to read one page from our newly handed out Acids and Bases booklet.
That's about it!
That's about it!
Friday, May 1, 2009
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