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
jarptica [38.1K]
3 years ago
8

On your first day working in a laboratory, you are told to make up 1 Liter of a 0.5 Molar Tris solution with a pH of 7.4. You me

asure out the appropriate amount of Tris base and dissolve it in water. You then measure the pH and find out that it has an initial pH of 11. You add some concentrated HCl, and the pH begins to drop. However, as you approach the target pH, you find that you need to add large amounts of HCl to lower the pH even a small amount. If the molecular weight of Tris base is 121.14, how many grams did you use
Chemistry
1 answer:
GenaCL600 [577]3 years ago
7 0

Answer:

60.57g of TRIS did you use

Explanation:

The concentration of the Tris solution buffer is 0.5 molar (That is, 0.5 moles per liter). As you need to make 1L, you need to have in the solution <em>0.5 moles of TRIS.</em>

<em />

To convert these moles of TRIS to grams you need to use the molecular weight of TRIS base (121.14g/mol), thus:

0.5 moles TRIS * (121.14g / mol) =

<h3>60.57g of TRIS did you use</h3>
You might be interested in
Which is most affected by a tropical warm air mass?
emmainna [20.7K]
The answer is B) Miami, Florida.
3 0
3 years ago
Read 2 more answers
_______________________ turns blood to cherry red and produces a patchy, pinkish color in the lividity of the corpse.a. Carbon m
IgorC [24]

Answer: a. Carbon monoxide

Explanation:

The carbon monoxide gas competes with the oxygen in the blood to occupy the binding affinity of the hemoglobin thus the blood changes it's color to cherry red.

In postmortem lividity, the body becomes discolored due to the effect of flow of blood from the interstitial tissues and suspended under the force of gravity. This can be seen on the dependent parts of the body and the position of body after death. The color of the postmortem lividity depends on the color of the hemoglobin.

In case of carbon monoxide poisoning the color of postmortem lividity appears to be cherry red as color of the hemoglobin is cherry red. Thus cherry red or dark pinkish patches appear in the corpse as lividity.

8 0
3 years ago
Approximately how many mineral species have scientists identified?
nekit [7.7K]
I think it’s 5000 because it says that their is over 4,124 valid species of minerals.
3 0
3 years ago
Read 2 more answers
What is the likely impact of water's high specific heat on life on Earth? (3 points)
statuscvo [17]

Answer:

Marine life is least affected by the temperature fluctuations of the atmosphere.

Explanation:

The high specific heat capacity of water means that it takes much more energy to raise the temperatures of water by one (1) degree than land. This means that on a hot sunny day, land temperatures would increase dramatically while ocean temperatures would only rise slightly. Conversely,  at night, the land cools rapidly while oceans cool slowly hence the temperatures drop slightly.

7 0
3 years ago
At what point is base no longer added during a titration
maria [59]
When you doing a titration, you need to use an indicator to confirm whether the reaction is completed. When the indicator has the color change and will not change back in one minute, the reaction is finished and you don't need to add more.
8 0
3 years ago
Other questions:
  • Fertilizers have nutrients that help plants grow. Sometimes, when it rains, fertilizers are washed away from farmland into ponds
    6·2 answers
  • How many KJ are given off when 120 grams of water are cooled from 25°C to -25°C?
    13·1 answer
  • In what circumstances do scientists use observational research and opinion based research?
    10·1 answer
  • This problem has been solved!
    11·1 answer
  • Question 2 (2 points)
    11·1 answer
  • 5.75 moles of H2 gas to liters at STP
    5·1 answer
  • Joe is given a 118 g sample of an impure aqueous solution. The solution does not conduct electricity so he assumes the impurity
    14·1 answer
  • Does somebody know the answer ?
    12·1 answer
  • What is the independent
    8·2 answers
  • Vanadium v hydroxide formula
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!