#1. Given the ph of 7 explain how many hydroxide -OH and hydronium H30+ are present in the solution.

#2. given the molar concentration of .0045 Hydrochloric acid (a strong acid) please calculate the pH of the solution.

#3. While performing a Titration of Vinegar (acetic acid) to determine its concentration using Sodium Hydroxide the following data was collected.
150 ml of vinegar with unknown molarity
45.5 ml of .5 M NaOH added to reach equivalence point
Determine the Molarity of the vinegar show all work for credit.

#1. Gaseous Hydrogen Iodide is placed in a closed container at 425 C, Where it partially decomposes to Hydrogen and Iodine:
2HI (g) H2 (g) + I2 (g)
The following are given:
[HI] = 2.53 * 10-3 M [H2] = 3.79 * 10-4 M [I2] = 3.79 * 10-4 M
Show the equilibrium Constant formula
What is the value of Kc at this temperature? Show all work for credit.

#2. The two common chlorides of Phosphorus, PCl3 and PCl5, both important in the production of other phosphorous compounds, coexist in equilibrium through
PCl3 (g) + Cl2 (g) PCl5 (g)
At 250 C, an equilibrium mixture in a 2.50 L flask contains 0.105 g PCl5, 0.220 g PCl3, and 2.12 g Cl2.
Show the equilibrium Constant formula
What are the values of (a) Kc for this reaction? Show all work for credit.

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