Calculate the Ka for aqueous hydrogen cyanide dissociation at 258.0 oC.  The ΔGo for HCN(aq) = 112 kJ/mole and ΔGo for CN-1(aq) = 166 kJ/mole.   HCN(aq) ↔ H+1(aq) + CN-1(aq) Group of answer choices 4.87x10-6 6.31x10-10 1.17x10-11 5.86x10-13 0.989

Calculate the Ka of HA given A−(aq)+H2O(l)⇌OH−(aq)+HA(aq)          Kb = 9.60×10-7

Malic acid (H₂CH₂O) derives its name from the genus name for apples (Malus), from which it was first isolated. It is the main acid in many fruits (including apricots, cherries, peaches and pears) and is widely used as a food additive to enhance sweetness or tartness. Malic acid is a diprotic acid with pK = 3.40 and pK = 5.11 at 25°C. Calculate the following for a 0.20 M malic acid solution at 25°C. pH = [HCHO]= [HCH_O5]=

4 of 15 > Calculate the standard enthalpy of reaction, AHxn, of each of the given acid-base neutralization reactions involving the strong base KOH. The standard enthalpy of formation data are provided. $ = R Compound or Ion Standard Enthalpy of Formation (kJ/mol) -482.4 -285.8 -98.4 -349.5 -121.0 -372.1 -132.5 -80.3 -251.2 AHixn = F KOH(aq) H₂O(1) HCIO3(aq) KCIO₂ (aq) V HBr(aq) KBr(aq) NH(aq) HCIO3(aq) + KOH(aq) → KCIO3(aq) + H₂O(1) NH, (aq) K+ (aq) G Search or type URL % 5 T G B MacBook Pro 6 Y H & ve 7 N U J 00 8 M I ( 9 K O < H O L command A P Δ' 1 - ; 3 Question option [ + 11 + 21 = ? kJ/mol 11

Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids. Note: be sure each number you put in the table has the correct number of significant digits. acid B C Ka M 0 7.28 x 10 pK 1.17 11.3 0 relative strength (Choose one) ✓ (Choose one) ✓ (Choose one) ✓ O *10 X ?

Using the ionization constants (Ka and Kb), determine which of the following reactions will be reactant-favored at equilibrium at 25 °C. Select all that apply. Group of answer choices NH4+(aq) + PO43-(aq) ⇌ NH3(aq) + HPO42-(aq) HNO2(aq) + HS-(aq) ⇌ NO2-(aq) + H2S(aq) HCN(aq) + ClO2-(aq) ⇌ CN-(aq) + HClO2(aq) H2CO3(aq) + SO32-(aq) ⇌ HCO3-(aq) + HSO3-(aq)

For the reaction shown below, predict whether the reactants or the products are predominant at equilibrium. HCN (aq) + H2O (l) ⇄ CN- (aq) + H3O+ (aq)    Keq = 4.9 x 10^-10 M Can you help me, please? Can you explain to me?

(Incorrect) Given Ka of HCN = 4.9×10-10 K₂ of CN¯ = 2.0x10-5 Determine the value of K for CN (aq) + H₂O(l) ⇒ OH¯(aq) + HCN(aq) Insert your answer in E-notation to 2 significant figures. You answered: 0.98 The correct answer is: 2.0E-5

When carbon dioxide gas dissolves in water, it reacts with the water to form carbonic acid. This is why soft drinks have a low pH, and soda water is often recommended as a mild cleaning agent. It is also why there is concern that rising levels of atmospheric carbon dioxide may cause the Earth's oceans to become more acidic. Here is the reaction between carbon dioxide gas and water: H₂O(1) + CO₂(g) H₂CO3(aq) Suppose an engineer decides to study the rate of this reaction. He prepares four reaction vessels with 152.7 g of water and 34.3 g of carbon dioxide gas each. The volume and temperature of each vessel is shown in the table below. Arrange the reaction vessels in decreasing order of initial rate of reaction. In other words, select a "1" next to the vessel in which the engineer can reasonably expect the initial rate of reaction to be highest, a "2" next to the vessel in which the initial rate of reaction would be next highest, and so on. vessel volume temperature A B C D 8.0 L 1.0 L…

Phosphoric Acid has a K₂ = 7.5 x 10-3 Hydrocyanic Acid has a K₂ = 4.9 x 10-10 Which is the stronger acid?