Science Study Guide for Wednesday's Test

Hi Students and Parents! Here is the science study guide for our test on Wednesday!

• Know that the pH scale was invented by a Danish biochemist named Soren Sorensenin in 1909.
• The pH is the value of a liquid's acidity or basicity (Alkalinity)
• The more Hydroxide Ions (OH-) the more acidic the solution. The less (OH-) the less acidic the solutions is.
• The more Hydrogen Ions (H+) the more base or Alkaline a solutions is, and the less (H+) ions the less base or alkaline a solution is.
• pH stands for Pouvoir Hydrogene, which means Hydrogen Power.
• The pH scale ranges from 0-14. Less than 7 is acidic, and the lower the number the more acidic the solutions is.
• Greater than 7 is base or alkaline. The higher the number, the more base is the solution.
• 7 is neutral. Our drinking water is neutral
• Using the pH testing strips, we know the yellow and orange means the solution is acidic.
• green is neutral
• dark green-blue-purple is base
• Remember what we tested. Milk, tums, baking soda, salt water and saliva are base solutions
• Lemon juice, grape soda, vinegar, fertilizers and acid rain are acidic
• Remember the video we watch on pollution? Carbon Monoxide is a by product from factories and automobiles. This harmful gas releases Sulfur and Nitrogen in the Atmosphere. When mixed with water vapor, Sulfur becomes Sulfuric Acid and Nitrogen becomes Nitric Acid. When it rains, we get Acid Rain.
• Remember that road salt, acid rain, and fertilizer can destroy the pH balance in an ecosystem, killing animals.
• Study the pH picture for and extra credit question.

GOOD LUCK STUDYING!