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EleoNora [17]
2 years ago
7

PLEASE HELP!

Chemistry
1 answer:
Andrei [34K]2 years ago
7 0
We will first calculate the concentration of sodium hydroxide, knowing the massive K hp. That was required to neutralize the 22.65 ml of sodium hydroxide solution. So the polarity sodium hydroxide will be take the massive K HP divided by its molar mass to get moles K HP. Then recognize one mol K HP reacted with one mole sodium hydroxide. Now we have mold sodium hydroxide to get concentration. We simply multiply by the leader volume of the sodium hydroxide solution. 22.65 ml is .02265 L. And we get a polarity of zero 0.3351 Molar sodium hydroxide. Now to calculate the concentration of hcl, we need to know the molds hcl divided by the volume of the hcl solution. To get the moles. Hcl will take the 25 ml of sodium hydroxide used in the tight rations converted to leaders. 25 ml is .02500 l multiply that by the concentration of sodium hydroxide that we just determined up here to get mold sodium hydroxide, then convert moles sodium hydroxide into molds. Hcl, recognizing it's a 1 to 1 molar relationship. Now that we have moles hcl, we just divide by the leaders of the hcl solution that was titrate, id 0.2. Sorry, 23.35 mL is 0.2335 liters. And we get a concentration of 0.3588 molar hcl. I hope that helps
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g You observed the formation of several precipitates in the Reactions in Solution lab exercise. Identify the precipitate in each
RUDIKE [14]

<u>Answer:</u>

<u>For a:</u> Lead iodide is a yellow precipitate.

<u>For b:</u> Barium sulfate is a white precipitate.

<u>For c:</u> Ferric hydroxide is a brown precipitate.

<u>For d:</u> Copper (II) hydroxide is a blue precipitate.

<u>Explanation:</u>

Precipitation reaction is defined as the reaction where a solid precipitate (solid substance) is formed at the end of the reaction. It is insoluble in water.

For the given options:

  • <u>For (a):</u>

The chemical reaction between KI and lead (II) nitrate follows:

2KI(aq)+Pb(NO_3)_2(aq)\rightarrow PbI_2(s)+2KNO_3(aq)

The iodide of lead is generally insoluble in water. Thus, lead iodide is a yellow precipitate.

  • <u>For b:</u>

The chemical reaction between barium chloride and sulfuric acid follows:

BaCl_2(aq)+H_2SO_4(aq)\rightarrow BaSO_4(s)+2HCl(aq)

The sulfate of barium is insoluble in water. Thus, barium sulfate is a white precipitate.

  • <u>For c:</u>

The chemical reaction between NaOH and ferric chloride follows:

3NaOH(aq)+FeCl_3(aq)\rightarrow Fe(OH)_3(s)+3NaCl(aq)

The hydroxide of iron is insoluble in water. Thus, ferric hydroxide is a brown precipitate.

  • <u>For d:</u>

The chemical reaction between NaOH and copper sulfate follows:

CuSO_4+2NaOH\rightarrow Cu(OH)_2+Na_2SO_4

The hydroxide of copper is insoluble in water. Thus, copper (II) hydroxide is a blue precipitate.

6 0
3 years ago
Which scenario suggest that the results of an experiment are reliable
ale4655 [162]
What is a reliable scientific experiment?experiment, experimentation, experiments, reliable scientific experiment, science, scientific, scientific experiment, scientific experiments, scientific method

Now that the atheists have taken over science and have de-valued and discouraged experimentation I’ll try to re-value experimentation and encourage experimentation again like how it use to be prior to atheists taking over science in the late 1960s and early 1970s.

Why have atheists done this? It’s because experimentation gives us data that reflects reality, and often reality behaves very differently from how scientists want to think it does. Modern day atheist scientists want to find data that matches into their incredulity and mathematical models, not data that necessarily reflects how reality works.

Remember, experimental data is used to verify the accuracy of mathematical models, not the other way around like many modern day scientists think.

So I’ve come up with the basic properties of a highly reliable scientific experiment.

The Properties of a Reliable Scientific Experiment:

– Repeatability:  This means that the exact same results of the experiment are duplicated over and over again (when following the exact same set of systematic procedures). If the results of an experiment can be repeated over and over again yielding the exact same effect when following the exact same set of procedures, then the results of the experiment cannot be denied (although the results can possibly be interpreted differently). If your experiment only yields a certain result one time or a few times or in a non-repeatable condition then the experiment is not useful or scientific.

– Controls: Since correlation is not causation it’s important to have controls (if possible) to determine what’s causing certain results in an experiment. Having controls eliminates certain variables causing certain effects in the results of an experiment.

A simple example can be seen with determining which fertilizer is best for plant growth. In order to create a scientific experiment you would have to keep all the variables the same except for the fertlizer (these are the controls). Like the plant type, the amount of water each day, the time watered, the exposure to light, etc…

Without having control variables it would be unclear as to what’s causing the results in the experiment.

– <span>Not Relying on Subjective Users: </span> This ties into repeatability and means that the experiment doesn’t rely upon any subjective methodology, like only working if special users participate, a subjective bias or anything like that. Take for instance remote viewing experiments that only work if specially trained remote viewers participate. Since they would only work if special users participate it doesn’t give us any reliable repeatable data that’s useful in science.


So i hope this helps you and please makes this the brainly-est  answer...thanks 

4 0
3 years ago
What are the missing coefficients for the skeleton equation below?
Kruka [31]

Answer:

4, 3 , 2 and 6

Explanation:

The reaction equation is given as;

       NH₃  +  O₂   →    N₂   +   H₂O

Now, we need to balance the reaction equation;

     NH₃  +  O₂   →    N₂   +   H₂O

put the numbers a,b,c and d;

    aNH₃  +  bO₂   →    cN₂   +   dH₂O  

We need to balance the equation algebraically, ;

  Conserving N;

      a = 2c

   Conserving H;

      3a  = 2d

   Conserving O;

      2b  = d

Now, let c = 1, a = 2, d  = 3 and b  = \frac{3}{2}  

  multiply through by 2;

            a  = 4, b = 3, c  = 2 and d  = 6

Insert the parameters:

                  4NH₃  +  3O₂   →    2N₂   +   6H₂O

4 0
3 years ago
7.95x10 converted to the number is
Svet_ta [14]

7.95 × 10

= 79.5

This is the answer

7 0
3 years ago
Which coefficients correctly balance the formula equation nh4no2(s)® n2(g) + h2o(l)?
Nonamiya [84]
<span>NH4NO2(s)---> N2(g) + 2H2O(l)</span>
8 0
3 years ago
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