if the pka of a weak acid is equal to 4 what is the percent of...

Question

Question

if the pka of a weak acid is equal to 4 what is the percent of A- at ph = 5?

91

9

99

1

science chemistry

Answer 1

Answer #1

Manderson En [A) РИ - PRst ој (КА) 5 - 9 + to. (АГ) (НА) ГА) (НА) (А] = 3) ч, жhion) 10 x1067 1 [A) 100 % - о lot (HAITIA

Answer 2

Similar Homework Help Questions

The pka of a weak acid is useful for identification of an unknown acid because it...

The pka of a weak acid is useful for identification of an unknown acid because it is a constant (as long as temperature remains the same). When a weak acid is titrated with a strong base, the pka of the weak acid equals the pH at the half-equivalence point. A 0.3210 g sample of weak monoprotic acid is delivered into laboratory glassware. It will be used for titratation against 0.1254 M NaOH. If the molar mass of the weak acid...
In a weak acid when [HA]=[A-]the pH = the pKa. What is the pH after adding...

In a weak acid when [HA]=[A-]the pH = the pKa. What is the pH after adding 0.50 moles HCl to a solution of HA =1 mole and A- = 1 mole. The pKa of the weak acid = 4
When the concentrations of weak acid [HA] and its conjugate base [A-] are equal, what is the relationship between the pH...

When the concentrations of weak acid [HA] and its conjugate base [A-] are equal, what is the relationship between the pH and pKa based on the Henderson-Hasselback equation? pH < pKa pH = pKa pH > pKa

Omeprazole has a pKa value of 7.1. Is Omeprazole a weak acid or weak base? Circle...

Omeprazole has a pKa value of 7.1. Is Omeprazole a weak acid or weak base? Circle the acidic or basic functional group in the structure 2. Calculate the percentage of omeprazole in the neutral form (non-ionized) in stomach (pH 1.5) and small intestines (pH 6.5). 3. What would you expect the pKa value of the carboxylic acid group in the derivatized omeprazole? Is the derivatized omeprazole an acid, base or something else? 4. Explain why the omeprazole derivative may have...
For the titration of a weak acid with a strong base what is the pKa of...

For the titration of a weak acid with a strong base what is the pKa of the weak acid if the pH is 6.72 at the equilvalence point (100% T), 9.12 at the end point, and 3.3 at 50% T? Please answer with one sig fig.
1) Use the Acid-Base table to determine the pKa of the weak acid HCN. 2) What...

1) Use the Acid-Base table to determine the pKa of the weak acid HCN. 2) What is the pH of a 0.00412 M solution of HCl? 3) What is the pH of 0.00685 M solution of NaOH?

20) the pH at the half titrated point of a weak acid strong base titration curve is 4.15, what is the pka and the f...

20) the pH at the half titrated point of a weak acid strong base titration curve is 4.15, what is the pka and the for the weak acid being titrated 9 7.08X10-9 Opha 4.15
A 0.100 molar solution of weak acid HA has pH of 2.45 What is pka? Hint,...

A 0.100 molar solution of weak acid HA has pH of 2.45 What is pka? Hint, find [H+] from pH and plug it into into ICE as 'X' HA (+H20) А" <> H30* 0.100 M 0 0 С E 0.100 - X х х solve for Ka, then pka Ka = [H30*1 [A]/[HA] 39 24 6.1 45 5.4 Consider the titration of 25.00 ml of 0.100 MHA with 25.0 0.100 M NaOH. HA +H20 --> A™ + H307 The Ka...
Please answer both 8. If a buffer is prepared with equal volumes of the weak acid...

Please answer both 8. If a buffer is prepared with equal volumes of the weak acid and conjugate base that have the same molarity, how is the pH related to the pKa? If a buffer is made so that the amount of weak acid is greater than the amount of conjugate base, what would be the impact on the pH? 9. Use the buffer from the video "Buffer Solution pH Calculations'" for these questions. If the buffer were prepared with...

A) If the weak acid in a buffer system has pKa 10.5, in what pH range...

A) If the weak acid in a buffer system has pKa 10.5, in what pH range is the system a most effective buffer? B) In the phosphate buffer system containing K2HPO4 and KH2PO4, what is the weak acid? What is its conjugate base?