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Pharmaceutics Formulas > Acid/Bases+Salts+Buffers > Flashcards

Acid/Bases+Salts+Buffers Flashcards

1
Q

What is the formula for changing the volume of a solution and its effect on concentration?

A

M1xV1 = M2xV2

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2
Q

What is the formula for pH with respect to hydrogen ion concentration?

A

pH = -log [H3O+]

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3
Q

What is the pH of a solution with respect to Hydroxide Ion concentration?

A

pH = 14 - pOH, pOH = -log [OH-]

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4
Q

How does one calculate the proportional constant where the rate of acid and water ionize at the same rate that Hydronium and a conjugate base deionize (also known as equilibrium)?

A

Keq = k2/k1 where k2 = [A-] x [H3O+] and k1= [HA] x [H2O]

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5
Q

What is the strength of an acid where water is considered in such an excess as to be constant?

A
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6
Q

How do you modify acidic strength values into a usable scale?

A
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7
Q

What is the Henderson-Hasselbalch equation?

A
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8
Q

How do you calculate the pH of a weak acid?

A
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9
Q

How do you calculate the pH of a weak base?

A
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10
Q

How do you calculate the pH of a strong acid+weak base salt?

A
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11
Q

How do you calculate the pH of a salt made of a weak acid and strong base?

A
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12
Q

How do you calculate the percent ionization for an unionized acid or ionized base?

A
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13
Q

How do you calculate the percent ionization for an unionized base or ionized acid?

A
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14
Q

When creating a buffer, what formula will you always turn to?

A

The Henderson-Hasselbalch equation!

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15
Q

How do you calculate the solubility of a Weak Acid?

A
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16
Q

How do you calculate the solubility of a Weak Base?

A
17
Q

What is the formula for first order half life?

A

.693/k1

18
Q

What is the shelf life for a first order reaction?

A

.152*half life

19
Q

What is the shelf life of a second order reaction?

A

.111/(k2[A0])

20
Q

What is the half life for a second order reaction?

A

Shelf life*9

Pharmaceutics Formulas (1 decks)

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