All categories

2 years ago

Calculate the pH of a buffer solution prepared by mixing 75.0 mL of 1.00 M lactic acid and 25.0 mL of 0.50 M sodium lactate.

Chemistry

1 answer:

max2010maxim [7]2 years ago

6 0

From the calculations, the pH of the buffer is 3.1.

<h3>What is the pH of the buffer solution?</h3>

The Henderson-Hasselbach equation comes in handy when we deal with the pH of a buffer solution. From that equation;

pH = pKa + log[(salt/acid]

Amount of the salt = 25/1000 * 0.50 M = 0.0125 moles

Amount of the acid = 75/1000 * 1.00 M = 0.075 moles

Total volume = ( 25 + 75)/1000 = 0.1 L

Molarity of salt = 0.0125 moles/0.1 L = 0.125 M

Molarity of the acid = 0.075 moles/0.1 L = 0.75 M

Given that the pKa of lactic acid is 3.86

pH = 3.86 + log( 0.125/0.75)

pH = 3.1

Learn more about pH:brainly.com/question/5102027

#SPJ1

You might be interested in

At elevated temperature, carbon tetrachloride decomposes to its elements: CCl4(g) C(s) 2Cl2(g). At 700 K, if the initial pressur

PIT_PIT [208]

Answer:

$K=0.0131M$

Explanation:

Hello,

In this case, the undergoing chemical reaction turns out:

$CCl_4(g) \rightleftharpoons C(s)+ 2Cl_2(g)$

In such a way, by means of the mass of law action for such reaction, which is given below:

$Kp=\frac{p_{Cl_2}^2}{p_{CCl_4}}$

And in terms of the change $x$ due to reaction extent:

$p_{CCl_4}=p_{CCl_4}^0-x\\p_{Cl_2}=2x\\p_T=p_{CCl_4}+p_{Cl_2}=1.00-x+2x\\p_T=1.00+x$

$x$ results:

$x=1.35 atm -1.00atm=0.35atm$

In such a way, Kp:

$Kp=\frac{(2x)^2}{1.00-x} =\frac{(2*0.35atm)^2}{1.00atm-0.35atm}=0.754atm$

Nonetheless, K is asked instead of Kp, thus:

$K=\frac{Kp}{(RT)^{\Delta \nu _{gas}}}$

Whereas:

$\Delta \nu _{gas}=2-1=1$

Which is the change in the moles of gaseous species chlorine and carbon tetrachloride. Hence, we finally obtain:

$K=\frac{0.754atm}{(0.082\frac{atm*L}{mol*K}*700K)^{1}}\\\\K=0.0131mol/L=0.0131M$

Best regards.

8 0

3 years ago

BRAINLIST!!

kolezko [41]

Answer:

D or C.

Explanation:

Sorry if its wrong

8 0

3 years ago

What is the frequency of a 670 nm light wave?

Morgarella [4.7K]

Nobody knows this answer I checked a bunch of websites and they all don't know the answer.

5 0

3 years ago

Read 2 more answers

En los espacios en blanco escribe si la reacción es de síntesis, análisis, simple sustitución o doble sustitucion

Artist 52 [7]

I really can’t help sorry

6 0

3 years ago

Consider the Van der Vaals equation of state: (????+????????????)(????−????)=???????????? where p is pressure, V is volume, n is

yanalaym [24]

Answer:

Units of a = $\frac{atm\ L^2}{mol^2}$

Units of b = $\frac{L}{mol}$

Explanation:

The Van der Waal's equation is:-

$\left(P+\frac{an^2}{V^2}\right)\left(V-nb\right)=nRT$

Where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value

a and b are van der Waal's constant

If pressure is taken in atm and volume in L. So,

$P+\frac{an^2}{V^2}$ represents the pressure correction term. Then,

Units of a = $\frac{atm\ L^2}{mol^2}$

$V-nb$ represents the volume correction term. Then,

Units of b = $\frac{L}{mol}$

6 0

3 years ago