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Solnce55 [7]
3 years ago
10

The amount of matter in an object is ___ and a common unit is the ___.

Chemistry
2 answers:
german3 years ago
5 0

Answer:

The answer is D

Explanation:

Mass is the amount of matter in an object and gram is the common unit of measurement of mass

Rus_ich [418]3 years ago
4 0
The answer would be B.
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The titration of Na2CO3 with HCl has the following qualitative profile: a. Identify the major species in solution at points A-F.
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Answer:

Answer is explained in the explanation section below.

Explanation:

Solution:

Note: This question is incomplete and lacks very important data to solve this question. But I have found the similar question which shows the profiles about which question discusses. Using the data from that question, I have solved the question.

a) We need to find the major species from A to F.

Major Species at A:

1. Na_{2} CO_{3}

Major Species at B:

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Major Species at C:

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Major Species at D:

1. NaHCO_{3}

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At Halfway point B:

pH = pKa_{1} + log[CO_{3}.^{-2}]/[HCO_{3}.^{-1}]

pH = pKa_{1} = 6.35

Similarly, at halfway point D.  

At point D,

pH = pKa_{2} + log [HCO_{3}.^{-1}]/[H2CO_{3}]

pH = pKa_{2} = 10.33

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3 years ago
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