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3 years ago

Solution A is yellow when alizarin yellow is added and blue when thymol

Chemistry

1 answer:

alexira [117]3 years ago

3 0

Answer:

D. 6.3 x 10-5 mol/L NaOH

Explanation:

Alizarin yellow is an indicator that is yellow when pH < 10.1. In the same way, thymol blue is blue when pH > 9

That means the pH of the solution is between 9 - 10.1

Any acid as HCl could have a pH of these.

The solution of 3.2x10⁻⁴M NaOH has a pH of:

pOH = -log[OH-] = 3.49

pH = 14-pOH = 10.51. The pH of the solution is not 10.5

Now, the solution of 6.3x10⁻⁵M NaOH has a pH:

pOH = -log[OH-] = 4.2

pH = 14-pOH = 9.8

The pH of the solution could be 9.8. Right option is:

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Explanation : Given,

Mass of given compound = 40 g

Atomic mass of X = 50 amu

Atomic mass of Y = 45 amu

Atomic mass of Z = 10 amu

First we have to calculate the molar mass of given compound.

The given compound formula is, $X_5Y_7Z_6$

Molar mass of $X_5Y_7Z_6$ = (5 × Atomic mass of X) + (7 × Atomic mass of Y) + (6 × Atomic mass of Z)

Molar mass of $X_5Y_7Z_6$ = (5 × 50) + (7 × 45) + (6 × 10) = 625 g/mol

Now we have to calculate the moles of given compound.

$\text{Moles of given compound}=\frac{\text{Mass of given compound}}{\text{Molar mass of given compound}}$

$\text{Moles of given compound}=\frac{40g}{625g/mol}$

$\text{Moles of given compound}=0.064mol$

Thus, the moles of given compound is, 0.064 mole

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4 years ago

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Answer:

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Explanation:

Scientists test every hypothesis they make for their investigation, before moving onto bigger conclusions.

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