chem 2 lab 0404

Topics: Chemistry, Hydrogen, Sodium Pages: 2 (761 words) Published: October 6, 2014
1. The use of microscale techniques does not change the hazardous nature of the reagents we use. Briefly describe the hazards associated with even small amounts of each of the following:





a. concentrated hydrochloric acid, HCl





HCL may be corrosive. It can cause burns to dosy tissue and can be deadly if inhaled or swallowed.
b. sodium hydroxide, NaOH, solution
NaOH is a very corrosive chemical and contact with it can cause burns to body tissue and possible eye damage. Can irriate the lungs and can cause permanent lung damage. also contact with water can generate enought heat to ignite combustibles.

2. In your own words, briefly explain the terms below. Copied answers will receive zero points. a. equilibrium state
When a chemical reaction is equal. when the products and reactients are at equal rates b. the effect of formation of a complex
a complex is a term used to describe a substance compused of two other substances.When pushing two substances together they can form a complex which is usually weaker than a regular chemical bond
3. A student is studying the equilibrium represented by the equation 2CrO42-(aq, yellow) + 2H3O+(aq) ← Cr2O72-(aq, orange) + 3H2O(l) →
The mixture obtained by the student is yellow.
a. Describe the color change the student should observe after adding concentrated hydrochloric acid to the equilibrium mixture.
A) Adding acid causes the mixture to become more orange. As H3O+ ion concentration increases, the system converts some of the H3O+ ion to water and dichromate ions. The additional dichromate ion causes the mixture to appear more orange than before.

b. Describe the color change the student should observe after adding solid sodium chromate to the equilibrium mixture.
(HINT: when sodium chromate is dissolved in water, it dissociates into ions.) D) Adding solid sodium chromate causes the mixture to become more orange. As it dissolves, the chromate ion increases and CrO4 -2 ion...
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