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VARVARA [1.3K]
2 years ago
15

Suppose you carry out a titration involving 2.50 molar NaOH and an unknown concentration of HBr. To bring the reaction to its en

d point, you add 49.2 milliliters of NaOH to 35.0 milliliters of HBr.
What is the concentration of the HBr solution?

A. 0.711 M
B. 1.41 M
C. 1.78 M
D. 3.51 M
Chemistry
1 answer:
givi [52]2 years ago
7 0

Answer:

B

Explanation:

Brainly Patrol ima stop you here

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<h3>Further explanation  </h3>

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is  

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The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20

Electron configuration of Ca : <em>1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²</em>

When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:

\tt 20-2 = 18

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