Catalyst: Journal Write Please write at least ONE full paragraph (minimum of five sentences), being sure to answer all of the following questions.  What.

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Catalyst: Journal Write Please write at least ONE full paragraph (minimum of five sentences), being sure to answer all of the following questions.  What items in your everyday lives are dyed?  Why is dye important?  What are some ways that you think dyes can connect to chemistry?

Studying Zebra Fish (Danio rerio) embryos

Examples of Fixing and Staining

pH and Indicators Day Learning Target: I can create three natural dye solutions – one acidic dye, one basic dye and one neutral dye. I can determine the pH of a dye using pH indicators. I can calculate the molarity and pH of each dye solution.

What is pH?  pH measures how acidic or basic a substance is.  The range of pH is from 1 (very acidic) 14 (very basic).  A substance with a pH of 1-6 is acidic.  Ex: lemon juice, stomach acid, vinegar  A substance with a pH of 8-14 is basic.  Ex: baking soda, antacids (tums), household cleaners  A substance with a pH of 7 is neutral.

What are pH indicators?  Detects hydronium (H 3 O + ) or hydrogen (H + ) ions in a solution  Causes a color change depending on the pH  Color change occurs over a narrow range. Universal_indicator_papers-SPL.jpg Phenolphtalein

How do pH, indicators, acids, bases and natural dyes connect?  The color of some natural dyes can be adjusted using NaHCO 3 (baking soda) and C 2 H 4 O 2 (vinegar).  Natural dyes can also be fixed by using mordants.  Made from salts or hydroxides of aluminums or chlorides.  Examples of Mordants: Alum, Cream of Tartar, etc. tuesday-natural-dyes-are-all-around-us-.html

Some Helpful Reminders  Molarity = moles of solute / liters of solution  pH = - log 10 [H 3 O + ]  pOH = - log 10 [OH - ]  [H 3 O + ] [OH - ] = 1.0 x  pH + pOH = 14 _math.jpg