Question

3. The $K_a$ for four acids are: $H_2CO_3$ = 4.5 x $10^{-7}$, $HCO_2H$ =1.8 x $10^{-4}$, $H_3C_6H_5O_7$ =7.1 x $10^{-4}$, HCN =6.2 x $10^{-10}$. If the pH's of 0.50 mol/L solutions of these acids were measured and they were placed in order from highest pH to lowest pH the results would be which of the following? a. HCN, $H_3C_6H_5O_7$, $HCO_2H$, $H_2CO_3$ d. $H_3C_6H_5O_7$, $HCO_2H$, $H_2CO_3$, HCN b. $H_2CO_3$, HCN, $H_3C_6H_5O_7$, $HCO_2H$ e. HCN, $H_2CO_3$, $H_3C_6H_5O_7$, $HCO_2H$ c. HCN, $H_2CO_3$, $HCO_2H$, $H_3C_6H_5O_7$ Explanation: 4. If the $K_a$ of a weak acid is 3.5 x $10^{-9}$, then the $K_b$ of its corresponding base must be which of the following? a. 2.9 x $10^{-8}$ b. 6.46 c. 2.8 x $10^{-6}$ d. 3.1 x $10^{-7}$ e. 3.4 x $10^{-7}$ Explanation

          3. The $K_a$ for four acids are:
$H_2CO_3$ = 4.5 x $10^{-7}$, $HCO_2H$ =1.8 x $10^{-4}$, $H_3C_6H_5O_7$ =7.1 x $10^{-4}$, HCN =6.2 x $10^{-10}$.
If the pH's of 0.50 mol/L solutions of these acids were measured and they were placed in order
from highest pH to lowest pH the results would be which of the following?
a. HCN, $H_3C_6H_5O_7$, $HCO_2H$, $H_2CO_3$
d. $H_3C_6H_5O_7$, $HCO_2H$, $H_2CO_3$, HCN
b. $H_2CO_3$, HCN, $H_3C_6H_5O_7$, $HCO_2H$
e. HCN, $H_2CO_3$, $H_3C_6H_5O_7$, $HCO_2H$
c. HCN, $H_2CO_3$, $HCO_2H$, $H_3C_6H_5O_7$
Explanation:
4. If the $K_a$ of a weak acid is 3.5 x $10^{-9}$, then the $K_b$ of its corresponding base must be which of the
following?
a. 2.9 x $10^{-8}$
b. 6.46
c. 2.8 x $10^{-6}$
d. 3.1 x $10^{-7}$
e. 3.4 x $10^{-7}$
Explanation

3. The Ka for four acids are:
H2CO3 = 4.5 x 10^-7, HCO2H =1.8 x 10^-4, H3C6H5O7 =7.1 x 10^-4, HCN =6.2 x 10^-10.
If the pH's of 0.50 mol/L solutions of these acids were measured and they were placed in order
from highest pH to lowest pH the results would be which of the following?
a. HCN, H3C6H5O7, HCO2H, H2CO3
d. H3C6H5O7, HCO2H, H2CO3, HCN
b. H2CO3, HCN, H3C6H5O7, HCO2H
e. HCN, H2CO3, H3C6H5O7, HCO2H
c. HCN, H2CO3, HCO2H, H3C6H5O7
Explanation:
4. If the Ka of a weak acid is 3.5 x 10^-9, then the Kb of its corresponding base must be which of the
following?
a. 2.9 x 10^-8
b. 6.46
c. 2.8 x 10^-6
d. 3.1 x 10^-7
e. 3.4 x 10^-7
Explanation

Added by Dale C.

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