Question

as chemistry unit 2 lesson 2 transfer task
when tie - dying shirts, a chemical called crystal violet is often used to produce a vibrant purple color. in order to maintain this purple color in the tie - dyed, strong bases, like sodium hydroxide, are often added to the dyed clothing. tamyra used crystal violet to tie - dye a piece of cloth but noticed something strange happened when she added sodium hydroxide to finish the process, as shown in the diagram below.
instead of maintaining the color, the sodium hydroxide made the color disappear. this was not what tamyra expected, and it made her wonder, \how can i slow down the fading of the purple color from my shirt?\
tamyra has the materials listed below available to use to design an experiment to slow down the fading of the crystal violet dye.
materials

• crystal violet dye solution
• sodium hydroxide solutions with various amounts of sodium hydroxide dissolved in water
• solution #1: 0.5 g of sodium hydroxide dissolved in 50 ml of water
• solution #2: 1 g of sodium hydroxide dissolved in 50 ml of water
• solution #3: 1.5 g of sodium hydroxide dissolved in 50 ml of water
• solution #4: 2 g of sodium hydroxide dissolved in 50 ml of water
• refrigerator (4°c)
• ice bath (3°c)
• room temperature counter (23°c)
• hot plate (37°c)
• beakers
• stir rods
• graduated cylinders
• thermometers
• balance
• timer/clock
• camera

experiment #1:
tamyra wants to test the experimental question of \how does the amount of sodium hydroxide affect how fast the purple color fades?\
iv:
dv:
she designs an experiment that has 4 beakers:

beaker a	beaker b	beaker c	beaker d

Explanation:

To solve for the independent variable (IV) and dependent variable (DV) in Tamrya's experiment:

Step 1: Identify the Independent Variable (IV)

The experimental question is "How does the amount of sodium hydroxide affect how fast the purple color fades?" The independent variable is the factor that is manipulated (changed) to observe its effect. Here, the "amount of sodium hydroxide" (specifically, the different concentrations of sodium hydroxide solution) is the variable being changed.

Step 2: Identify the Dependent Variable (DV)

The dependent variable is the factor that depends on the independent variable (it is the outcome being measured). In this experiment, the outcome being measured is "how fast the purple color fades" (i.e., the rate of color fading).

Answer:

IV: Amount of sodium hydroxide (or concentration of sodium hydroxide solution)
DV: How fast the purple color fades (or rate of purple color fading)