A backyard pool as a pH of 7.4. At this level, the concentrations of hypochlorus acid and hypochlorite are approximetly equal.

HClO(aq) <--> H^+ (aq) + ClO^- (aq)

(a) Predict the effect of increasing pH has on the concentration of HClO(aq) in the pool.

For this question, in order to decrease the pH, wouldnt you have too add more HClO to the pool or remove some of the ions?

(b) What would happen to the HClO(aq) if the pH was increased?
Again, dosent the pH change depend on the concentration of HClO in the pool? So if you add more then the concentration increases?

(c) Shock treatment is when a large amount of chlorine containing compounds are added to the pool. What effect would this have on the pH?

Basically, we`re adding a new reactant. Would this create hydrochloric acid? Hydrochloric acid is very acidic so would the pH drastically decrease?

a) assume increasing pH means someone is adding more H+ from another source.

b) HClO would increase
c) Assume you are adding chlorine compounds to water.
ClXXX- + HOH>>> H+ + ClxxxxO-
You have in creased the pH.

more acid = lower Ph number

Thank you :D

(a) Increasing the pH of the pool will shift the equilibrium towards the right, causing an increase in the concentration of hypochlorite ions (ClO-) and a decrease in the concentration of hypochlorous acid (HClO). This is because as the pH increases, more hydroxide ions (OH-) are present, and they will react with H+ ions to form water (H2O), thus reducing the concentration of H+. As a result, according to Le Chatelier's principle, the equilibrium will shift to the right to counteract the decrease in H+, resulting in an increase in the concentration of ClO- and a decrease in the concentration of HClO.

To increase the concentration of HClO in the pool, you would need to add more hypochlorous acid directly or use a chemical that generates hypochlorous acid when added to water, such as chlorine gas or sodium hypochlorite.

(b) When the pH is increased, the concentration of HClO will decrease. This is because at higher pH values, more hydroxide ions (OH-) are present, and they will react with H+ ions to form water (H2O), reducing the concentration of H+. As a result, the equilibrium will shift towards the right, favoring the formation of ClO- and causing a decrease in the concentration of HClO.

To increase the concentration of HClO in this case, you would need to decrease the pH by adding an acidic substance or using a pH-lowering chemical, such as muriatic acid.

(c) The addition of chlorine-containing compounds, such as in a shock treatment, can indeed affect the pH of the pool. The effect on pH depends on the specific compounds used for the shock treatment.

If the compounds used for shock treatment are acidic, they can lower the pH of the pool. For example, if you use a chlorine compound like calcium hypochlorite, it will dissociate in water to release hypochlorite ions (ClO-) and calcium ions (Ca2+), while also causing a slight increase in acidity due to the formation of some hypochlorous acid (HClO). This can result in a slight decrease in pH.

However, it's important to note that shock treatments can vary in composition, and some shock treatment products may have a neutral or even slightly alkaline pH, depending on the formulation. In those cases, the impact on pH may be minimal or even result in a slight increase.

In summary, the specific chlorine-containing compound used in a shock treatment, as well as its composition and pH, will determine the effect it has on the pH of the pool.