Use the table below to answer the following questions Name of acid Ka value Acet

Question

Use the table below to answer the following questions Name of acid Ka value Acetic Acid (HC_2H_3O_2) 1.8 times 10^-5 Formic Acid (HCO_2H) 1.8 times 10^-4 Nitrous Acid (HNO_2) 4.6 times 10^-4 Hydrofluric Acid (HF) 3.5 times 10^-5 Hydrocyanic Acid (HCN) 4.9 times 10^-10 Lactic acid (HC_3H_5O_3) 1.4 times 10^-4 The larger the Ka the (stronger/weaker) the acid. Since a weak acid dissociates incompletely setting up an equilibrium what method could you think of that you could use to determine the concentration of [H_3O^+] ions given the initial concentration of the acid and its Ka? What is the pH of a 0.025 M solution of acetic acid, HC_2H_3O_2. Write an equation for the dissociation of an acid Write an expression for the Ka of the acid in terms of the reactants and products Where could we possibly find the Ka of acetic acid? Write down the Ka of acetic acid. Create an ICE tableCH_7CO_2H H_20 CH_3CO_2 H_3O^+ I 0.25 - - C -x +x +v E 025-x +x +x Substitute into the expression for Ka and solve for the value of x. Ka = x^2/0.25-x x Squareroot 0.25 Ka x = 0.000471 What does the value of x represent? How can you use the value of x to find the pH? -10g (0.000471) = 3.17

Explanation / Answer

1.

A) Ka represent dissociation constant of acid. It is directly proportional to acidic strength. Hence larger the Ka stronger is the acid and vice versa.

B) strongest acid:- nitrous acid HNO2

Because it have largest Ka value.

Weakest acid:- HCN

Because it have smallest Ka value

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