1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nat2105 [25]
4 years ago
15

chemist must prepare of hydrobromic acid solution with a pH of at . He will do this in three steps: Fill a volumetric flask abou

t halfway with distilled water. Measure out a small volume of concentrated () stock hydrobromic acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrobromic acid that the chemist must measure out in the second step. Round your answer to significant digits.
Chemistry
1 answer:
Mademuasel [1]4 years ago
8 0

Answer:

32 mL

Explanation:

<em>A chemist must prepare 500.0mL of hydrobromic acid solution with a pH of 0.50 at 25°C. He will do this in three steps: Fill a 500.0mL volumetric flask about halfway with distilled water. Measure out a small volume of concentrated (5.0M) stock hydrobromic acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrobromic acid that the chemist must measure out in the second step. Round your answer to 2 significant digits.</em>

<em />

Step 1: Calculate [H⁺] of the dilute solution

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -0.50 = 0.32 M

Step 2: Calculate [HBr] of the dilute solution

HBr is a strong acid that dissociates according to the following equation.

HBr ⇒ H⁺ + Br⁻

The molar ratio of HBr to H⁺ is 1:1. The concentration of HBr is 1/1 × 0.32 M  = 0.32 M.

Step 3: Calculate the volume of the concentrated HBr solution

We will use the dilution rule.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0.32 M × 500.0 mL / 5.0 M

V₁ = 32 mL

You might be interested in
Synthesize Information In a multistep process, cells can combine the reactants glucose (C6H12O6) and oxygen (O2) to form the pro
zloy xaker [14]

Answer:

Explanation:

In one of the process, energy is built up from scratch, in the other one, energy is liberated for use by an organism or body.

The first process deals with a metabolic reaction in which energy is liberated:

         C₆H₁₂O₆ + 6O₂  → 6CO₂ + 6H₂O + energy

In the above process, energy is liberated when glucose combines with oxygen. The waste products are carbon dioxide and water. This process liberates heat energy which can be used to do work.

   In the reverse process:

             6CO₂ + 6H₂O   →  C₆H₁₂O₆ + 6O₂

    This process stores energy in carbon chains as chemical energy. It is this energy that is released in the first process.

Therefore, we can see that the first process liberates energy and the reverse process stores energy.

8 0
3 years ago
What caused the bubbles to form when you added the catalase to the hydrogen peroxide and water mixture at 40 °c?
Dahasolnce [82]
<span>What caused the bubbles to form when you added the catalyses to the hydrogen peroxide and water mixture at 40 °C? A. Catalyses activity heated the solution to its boiling point. B. Hydrogen gas formed during the formation of hydrogen peroxide. C. Oxygen gas formed during the decomposition of hydrogen peroxide.

This would be the water, mixture.</span>
7 0
3 years ago
Read 2 more answers
Complete combustion of 8.10 g of a hydrocarbon produced 25.9 g of CO2 and 9.27 g of H2O. What is the empirical formula for the h
balu736 [363]

CxHy     +  O2    -->    x CO2     +    y/2  H2O

 

Find the moles of CO2 :     18.9g  /  44 g/mol   =    .430 mol CO2   = .430 mol of C in compound

Find the moles of H2O:      5.79g / 18 g/mol     =     .322 mol H2O   = .166 mol of H in compound

 

Find the mass of C and H in the compound:

                             .430mol  x 12  =  5.16 g C

                              .166mol  x 1g   = .166g H   

 

When you add these up they indicate a mass of 5.33 g for the compound, not 5.80g as you stated in the problem.

Therefore it is likely that either the mass of the CO2 or the mass of H20 produced is incorrect (most likely a typo).

In any event, to find the formula, you would take the moles of C and H and convert to a whole number ratio (this is usually done by dividing both of them by the smaller value).

8 0
4 years ago
If earth did not rotate what would happen to the global winds and why?
Anna35 [415]
If earth didn't rotate the global winds would stay on the same speed of rate because the wind isn't moving without rotation in the earths axis.
3 0
4 years ago
Read 2 more answers
Which has a greater density: an extremely small diamond used for industrial purpose such as grinding or a two-carat diamond take
ExtremeBDS [4]

The question is incomplete, the complete question is shown in the image attached to this answer

Answer:

See explanation

Explanation:

15) The both diamonds- the diamond used as a grinding tool and the two -carat diamond both have the same density because density is an intensive or intrinsic property of a substance. It does not depend on the mass of the substance present.

16) Area of magnesium = Length * width = 0.104 * 10^2 cm * 2.52 * 10^-1 cm  = 2.62 cm^2

Density = mass/area * thickness

Density * area * thickness = mass

thickness = mass/Density * area

thickness = 0.104 g/ 1.74g/cm3 * 2.62  cm^2

thickness = 0.0228 cm

3 0
3 years ago
Other questions:
  • Which of the following reasons explains why some cooking pots are made of metal, but their handles are made of wood? Both wood a
    13·2 answers
  • Which of the following correctly represents an ion pair and the ionic compound the ions form
    13·2 answers
  • More than DOUBLE POINTS!! Please help ASAP!! 1 hour left !!
    9·2 answers
  • How much ml of sulfur dioxide are in one cubic meter of air if the ppm (parts per million) of sulfur dioxide in one cubic meter
    13·1 answer
  • Sex cells from female reproductive organ?
    7·2 answers
  • How many electron pairs exist in single bonds double bonds and triple bonds?
    7·1 answer
  • (PLZ HELP ON THERE ASAP!!!!) The force of gravity between two objects depends on the objects’ mass and
    13·1 answer
  • Which of the following do plants NOT take IN for photosynthesis?
    7·2 answers
  • If a substance melts at 20oC, what is its freezing point?
    11·1 answer
  • Please helpp!!!!!!!!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!