State the limits to the generality of the expression for estimating the pH of an amphiprotic salt solution. Suggest reasons for why these limitations exist.
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State the limits to the generality of the expression for estimating the pH of an amphiprotic salt solution. Suggest reasons for why these limitations exist.
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- Sodium acetate, NaCH3CO2, of mass 7.4 g is used to prepare 250 cm3 of aqueous solution. What is the pH of the solution?Describe the general features of the Debye-Huckel theory of electrolyte solutions. Which approximations limit its reliability to very low concentrations?The pH of an aqueous solution of 0.470 M methylamine (a weak base with the formula CH3NH2) is The pOH of an aqueous solution of 0.470M ethylamine (a weak base with the formula C2H5NH2) is The pH of an aqueous solution of 0.0755 M ascorbic acid, H,C6H606 (aq), is |
- The solution of total volume 0.50 L was prepared by the addition of 0.10 moles of KF to sifficient water. What are the major species of the solution and pH ?Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation CO2(g)↽−−⇀CO2(aq)?=0.032 The acid dissociation constants listed in most standard reference texts for carbonic acid actually apply to dissolved CO2. For a CO2 partial pressure of 2.1×10−4 bar in the atmosphere, what is the pH of water in equilibrium with the atmosphere? For carbonic acid, ?a1=4.46×10−7 and ?a2=4.69×10−11.Phosphate-buffered saline (PBS) is a solution commonly used in studies of animal tissues and cells. Its composition is 137 mM NaCl, 2.7 mM KC1, 10 mM Na, HPO, (pK, = 2.14), and 1.8 mM KH₂PO, (pK, = 6.86). Calculate the pH and osmolarity of PBS. Give the osmolarity in units of osmoles per liter (osm/L). pH = 7.605 osmolarity 313.0 Incorrect osm/L
- 25.0mL of 0.405M Ba(OH)2 (aq) was required to neutralise 27.1mL HCl (aq). What is the molarity of HCl (aq)?Q.3: Determine the pH of the dissociation of 0.1 M HCN (aq). For which the dissociation constant is equal to 4.9 x 10-5 and the weight and volume of the conjugated base is 5 g and 2 L respectively. (Write the chemical reaction).According to Henry’s law the atmospheric partial pressure of CO2 dictates the concentration of aqueous CO2 according to the following equilibrium expression where k is the Henry’s law constant for CO2. CO2 (g) <-> CO2 (aq) k=1x10^-1.5 The acid dissociation constant Ka for carbonic acid applies to CO2 (aq). Given pKa1=6.35 and pKa2=10.33 and the fact that the partial pressure of CO2 in the atmosphere is 10^-3.5 atm, find the pH of water in equilibrium with the atmosphere.
- Calculate the following: The vapor pressure of benezene, C6H6 at 25C in an ideal solution containing 1.66 mol of benezene and 0.313 of toulene. The vapor pressure of pure benezene is 96.0 torr.The pH factor is a measure of the acidity and alkalinity of water. A reading of 7.0 is neutral; values in excess of 7.0 indicate alkalinity; those below 7.0 imply acidity. In one study, it is mentioned that the best chance of catching bass occurs when the pH of the water is in the range 7.5 to 7.9. Suppose your suspect that acid rain is lowering the pH of your favourite fishing spot and you wish to determine whether the pH is less than 7.5. You obtained 10 samples and got the following data: 7.3, 7.4, 7.2, 7.0, 7.5,7.4,7.3,7.3,7.2 and 7.1. Use 0.05 alpha. a. State the alternative and null hypothesis. b. Is the pH of the water samples less than 7.5?A brand of window-cleaning fluid is composed of ammonia solution, water, a colouring agent, and a very small quantity of soap. It has 0.15 mol/L concentration of NH3(aq). What is the pH of this fluid?