Will the different flavors of khool aid effect the temperature of the boiling point

Calculate the pH of 1.00 L of a buffer that contains 0.105 M HNO2 and 0.170 M NaNO2. What is the pH of the same buffer after the

kari74 [83]

Answer:

1.- pH =3.61

2.-pH =3.53

Explanation:

In the first part of this problem we can compute the pH of the buffer by making use of the Henderson-Hasselbach equation,

pH = pKa + log [A⁻]/[HA]

where [A⁻] is the conjugate base anion concentration ( [NO₂⁻]), [HA] is the weak acid concentration,[HNO₂].

In the second part, our strategy has to take into account that some of the weak base NO₂⁻ will be consumed by reaction with the very strong acid HCl. Thus, first we will calculate the new concentrations, and then find the new pH similar to the first part.

First Part

pH = 3.40+ log {0.170 /0.105}

pH = 3.61

Second Part

# mol HCl = ( 0.001 L ) x 12.0 mol / L = 0.012

# mol NaNO₂ reacted = 0.012 mol ( 1: 1 reaction)

# mol NaNO₂ initial = 0.170 mol/L x 1 L = 0.170 mol

# mol NaNO₂ remaining = (0.170 - 0.012) mol = 0.158

# mol HNO₂ produced = 0.012 mol

# mol HNO₂ initial = 0.105

# new mol HNO₂ = (0.105 + 0.012) mol = 0.117 mol

Now we are ready to use the Henderson-Hasselbach with the new ration. Notice that we dont have to calculate the concentration (M) since we are using a ratio.

pH = 3.40 + log {0.158/.0117}

pH = 3.53

Notice there is little variation in the pH of the buffer. That is the usefulness of buffers.

4 0

3 years ago

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Calculate the delta S rxn at 25 degrees celsius for the reaction 2NH3(g)->>N2H4(g) + H2(g). Do you know where I can find t

Alchen [17]

In order to find your answer you need to be <span>measuring entropy, so you will be using the following formula:
</span><span>delta S= S of (N2H4) + S of ( H2) - [2( S of NH3)]
</span>Hope this is very useful for you

3 0

3 years ago

George was curious about the best way to recycle aluminum. His science teacher told him that there have been numerous studies al

solniwko [45]

I think that the answer is a research bc it’s just sounds like that right answer

3 0

3 years ago

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Which phrase tells a major function of the endomembrane system?

choli [55]

Answer:

A major function of the Endomembrane system is

The endomembrane system (endo- = “within”) is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.

Explanation:

The endomembrane system (endo = “within”) is a group of membranes and organelles (Figure 4.4. 1) in eukaryotic cells that works together to modify, package, and transport lipids and proteins. The endomembrane system is a series of compartments that work together to package, label, and ship proteins and molecules. In your cells, the endomembrane system is made up of both the endoplasmic reticulum and the Golgi apparatus. These compartments are folds of membranes that form tubes and sacs in your cells.

Hoped this helped! :D

6 0

3 years ago

You complete a chemical reaction and recover 79 grams of product. However, you calculate you should have recovered 104 grams of

spin [16.1K]

Percent yield is calculated using:
$percent \: yield = \frac{actual \: yield}{theoretical \: yield} \times 100\%$

Your actual yield is how much you actually had at the end of the experiment = 79g.

Your theoretical yield is how much you calculated you should have gotten in an ideal, perfect experiment = 104g.

So put those values into the equation:
$percent \: yield = \frac{79}{104} \times 100\% = 76\%$

5 0

3 years ago