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SSSSS [86.1K]
3 years ago
10

What is the PH of 8.1x10^-5 M HCLO4 solution

Chemistry
1 answer:
Ivanshal [37]3 years ago
6 0
HCl04 is a strong acid solution. So, in theory everything dissociates.

pH= -log(0.000081)= 4.09
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EXPERIMENT: DETERMINING VOLUME
Tanzania [10]

Explanation:

(Ques- A) Why does the first method for determining volume work only for a regular-shaped object?

<u>(Ans- A)</u> <em>Because the method requires precise dimensions of objects for result, which is not possible for irregular shaped objects.</em>

(Ques - B) Will the second method for determining volume work for any object or just an odd-shaped one? Why?

<u>(Ans-B)</u> <em>It will work for both regular and irregular shaped objects since both displace equal volumes of water.</em>

(Ques - C) Is one method of measurement more accurate than the other? Why or why not?

<u>(Ans-C)</u> <em>Both are pretty accurate, with some experimental errors which may creep in accidentally. </em>

(Ques- D) Would the displacement method of measurement work for a cube of sugar? What about a cork? Why?

<u>(Ans - D)</u> <em>No, the method would not work because sugar being soluble, will dissolve in water. </em>

<em>No, the method would not work because sugar being soluble, will dissolve in water. Cork is less dense than water so floats on it, with only part of it submerged in water, resulting in displacement of less volume of water than actual volume of Cork.</em>

(Ques-E) What did you find out from this investigation? Be thoughtful in your answer.

<u>(Ans- E)</u> <em>I learnt about determining volume of different objects from this investigation. </em>(Sorry, I know its not a very thoughtful answer)

7 0
3 years ago
If a flask maintained at 674 K contains 0.138 moles of NH4I(s) in equilibrium with 4.34×10-2 M NH3(g) and 9.39×10-2 M HI(g), wha
r-ruslan [8.4K]

Answer:

K = 4.07x10⁻³

Explanation:

Based on the reaction:

NH₄I(s) ⇄ NH₃(g) + HI(g)

You can define K of equilibrium as the ratio of concentrations of reactants and products, thus:

K = [NH₃] [HI] / [NH₄I]

But, as NH₄I is a solid, is not taken into account in the equilibrium, that means K expression is:

K = [NH₃] [HI]

As the concentrations in equilibrium of the gases is:

[NH₃] = 4.34x10⁻²M

[HI] = 9.39x10⁻²M

Equilibrium constant, K, is:

K = 4.34x10⁻²M * 9.39x10⁻²M

<h3>K = 4.07x10⁻³</h3>

4 0
2 years ago
A sample of octane burns releasing 2290 J of heat to the surroundings, and the gases produced expands against a piston to do 560
dexar [7]

<u>Answer:</u> The internal energy change for the reaction is -2850 J

<u>Explanation:</u>

  • <u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

  • <u>Sign convention of work:</u>

Work done for expansion process is taken as negative and work done for compression is taken as positive.

According to the First law of thermodynamics,

\Delta U=q+w

where,

\Delta U = internal energy

q = heat absorbed or released  = -2290 J

w = work done = -560 J

Putting values in above equation, we get:

\Delta U=(-2290)+(-560)\\\\\Delta U=-2850J

Hence, the internal energy change for the reaction is -2850 J

4 0
3 years ago
Give the number of significant figures: 0.882 mm
Margarita [4]
Number of significant digits is 3.

6 0
3 years ago
Read 2 more answers
when you hold a metal coat hanger in a camp fire to roast a marshmallow, the coat hanger might get too hot to hold. what type of
JulsSmile [24]

Answer:

Heat transfer by conduction

3 0
2 years ago
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