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Hatshy [7]
3 years ago
5

Explain why a solution that is 1.3 M HF and 1.3 mM KF is not a good buffer. HF is a strong acid and cannot be used in a buffer s

ystem. The ratio of acid to conjugate base is outside the buffer range of 10:1. The two species are not a conjugate acid base pair. KF is not soluble in water and cannot be used in a buffer system.
Chemistry
1 answer:
zavuch27 [327]3 years ago
4 0

Answer:

The ratio of acid to conjugate base is outside the buffer range of 10:1.

Explanation:

The Henderson-Hasselbalch equation for a buffer is

\text{pH} = \text{pK}_{\text{a}} + \log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}}

A buffer should have

\dfrac{1}{10} \leq \dfrac{\text{[A$^{-}]$}}{\text{[HA]}} \leq \dfrac{10}{1}

For a solution that is 1.3 mol·L⁻¹ in HF and 1.3 mmol·L⁻¹ in KF, the ratio is

\dfrac{1.3 \times 10^{-3} }{1.3} = \dfrac{1}{1000}

The ratio of acid to conjugate base is 1000:1, which is outside the range of 10:1.

A is wrong. NF is a weak acid.

C is wrong. The two species are a conjugate acid-base pair.

D is wrong. Salts of Group 1 metals are soluble.

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5 0
3 years ago
In general the human ear is most sensitive to sounds at 2500 hz. Assuming that sound moves at 330m/s what is the wavelength of s
elena-s [515]

Answer:

0.132 meters is the wavelength of sounds to which people are most sensitive.

Explanation:

Frequency of the sound human ears are most sensitive to = \nu = 2500Hz=2500 s^{-1}

Speed of the sound wave = S = 330 m/s

Wavelength of the sound human ears are most sensitive to = \lambda = ?

\nu=\frac{S}{\lambda }

2500 s^{-1}=\frac{330 m/s}{\lambda }

\lambda =\frac{330 m/s}{2500 s^{-1}}=0.132 m

0.132 meters is the wavelength of sounds to which people are most sensitive.

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3 years ago
Scientist can use the of minerals to tell them apart A.sound B.length C.size D.color
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Answer:

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Scientists can use the color of minerals to tell them apart.

7 0
4 years ago
How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm
Citrus2011 [14]

<u>We are given:</u><u>_______________________________________________</u>

Volume of Gas (V) = 2.5L

Pressure (P) = 1.2 atm

Temperature (T) = 25°C  OR 25+273 = 298 K

Universal Gravitational Constant (R) = 0.0821

<u>Solving for number of moles:</u><u>___________________________________</u>

From the Ideal Gas Equation,

PV = nRT

(1.2)(2.5) = n(0.0821)(298)           [plugging the given values]

n = [(1.2)(2.5)] / [0.0821*298]

n = 300 / [298*8.21]

n = 0.12 moles

Hence, there are 0.12 moles of Oxygen in 2.5L of 1.2 atm gas when the temperature is 25°C

7 0
3 years ago
12. If a substance has a pH of 3.5, is it<br> acidic or basic?
dolphi86 [110]
The answer is acidic.

pH < 7 = acidic

pH > 7 base
6 0
3 years ago
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