You will work with a relatively dilute aqueous solution of hydrochloric acid in this week's lab. Let's review some of the hazards and cautions associated with HCI (aq). Identify if each of the statements below is TRUE or FALSE. HCI (aq) is corrosive - particularly at higher concentrations. When preparing a dilute solution of HCI, it is safest to slowly add concentrated acid to water. 1. TRUE HCI (aq) is flammable - even at low concentrations. 2. FALSE When preparing a dilute solution of HCI, it is safest to slowly add water to concentrated acid.

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Order these chemical species by increasing pH of an 0.1 M aqueous solution of each. That is, imagine making an 0.1 M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. species ΙΟ HF HIO F ОН NO₂ HNO₂ H₂O relative pH of 0.1 M aqueous solution (Choose one) (Choose one) 3 5 8 (highest) (Choose one) 2 (Choose one) X Ś

First read the text sections 10.5 and 10.6 on pH. This is a Dry Lab since we cannot meet on Campus. After calibrating a pH meter you would have measured the pH of four different Basic Aqueous Solutions and examined the data for trends. You would have calculated the expected pH of each of the strong base solutions by assuming that for every NaOH formula unit that dissolves, one OH- ion is released. Thus, we can assume that the OH- Molarity equals the NaOH Molarity. Using the OH- Molarity and the water ionization equilibrium expression (Kw= 1.0 X 10 to the -14 power = H+ Molarity X OH- Molarity), we can calculate the H+ Molarity of the solution. Using the H+ Molarity, we can calculate the solution's pH. Thus a 1.0 X 10 to the 4 power NaOH solution has a pH of 10. The calculated pH value is arrived at as follows. By rearranging the water ionization equilibrium expression and plugging in the OH- Molarity, we can solve for H+ Molarity. H+ M = 1.0 X 10 to the -14 power divided by 1.0 X 10 to…