Question

(WILL GIVE BRAINLIEST IF YOU ANSWER ALL 4) Chemistry

1. What is the molarity of a solution containing 5 moles of NaCl in 2 liters of solution

a. 2.5
b. 3
c. 7
d. 10

2. Which of the following are common applications of freezing-point depression? Check the THREE that apply

a. Sprinkling salt on icy surfaces
b. Using antifreeze in automobile cooling systems
c. Heating sugar to make fudge
d. Using salt to make ice cream.

3. If the concentration of OH- is equal to 1 x 10^ -10 M, what is the pH and classification of the solution

a. 10, acidic
b. 10, basic
c. 4, acidic
d. 4, basic

4. Using the forward reaction below, identify the Bronsted-Lowry Acid

H20+NH3 ----> NH4+ + OH+

a. H20
b. NH3
c. NH4 +
d. OH +

Answer 1

Answer:

See explanations

Explanation:

a. Molarity = moles/Volume in Liters = 5moles/2Liters = 2.5M in NaCl

b. Freezing Pt Depression

     1. Sprinkling salt on icy surfaces

    2. Using antifreeze in automobile cooling systems

    3. Not an application

    4. Using salt to make ice cream

c. pOH = -log[OHˉ] = -log(1x10ˉ¹⁰) = -(-10) = 10 => pH = 14 – pOH = 14 – 10 = 4

d. H₂O + NH₃ => NH₄⁺ + OHˉ => Bronsted Acid is H₂O  (proton donor)