Question of the Day Rules

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Question of the Day Rules

• You must work alone
• You may NOT use your textbook today
• You have 4 minutes to complete the QOD
• Good luck!!

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• 1) Is each of the following substances an acid, a
  base or a salt? Explain why?
• HBr
• b)KOH
• BaF2

d) ZnSO4 e) H3PO4 f) Cu(OH)2
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Is each of the following substances an acid, a
base or a salt? Explain why?

• a) HBr

An Acid
HBr ? H and Br-
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Is each of the following substances an acid, a
base or a salt? Explain why?

• b)KOH

A Base
KOH ? K and OH-
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Is each of the following substances an acid, a
base or a salt? Explain why?

• BaF2

A salt
No H and OH- So we assume it is a salt
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Is each of the following substances an acid, a
base or a salt? Explain why?

• d) ZnSO4

A salt
No H and OH- So we assume it is a salt
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Is each of the following substances an acid, a
base or a salt? Explain why?

• e) H3PO4

An Acid
H3PO4 ? H and PO4 -
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Is each of the following substances an acid, a
base or a salt? Explain why?

• f) Cu(OH)2

A Base
Because of the OH-
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What are we doing Today?

• QoD (question(s) of the day)
• Concentration pH
• Chapter 1 Test next Wednesday
• Concentration Practice Problems
• Fun Friday (Wahooo!)

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PPM
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SHOW 3-9 PPM

• Complete the following
• 1) Convert 17g/L into ppm
• 2) Convert 5ppm into g/L

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SHOW 3-9 PPM

• Complete the following in your workbook
• 1) Convert 25 g/L into ppm
• 2) Convert 120 ppm into g/L

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• Notes
• If the pH lt 7, the solution is acidic
• If the pH 7, the solution is neutral
• If the pH gt 7, the solution is basic

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The pH Scale

• Each pH unit is 10 times as large as the previous
  one
• A change of 2 pH units means 100 times more basic
  or acidic

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The pH Scale

• Careful measurement is important
• A mistake of one pH unit means 10 times too much
  or too little!

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Why is pH important?
Fish cant live if the pH is too high or too low
Soil has to be in a certain pH range for plants
to grow and stay healthy.
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Classwork

• -Study for the chapter 1 test on Wednesday (ST)
• -Study for the chapter 1 test (EST)
• -Finish Concentration problem sheet
• Recuperation today after school