Answer:
D
Explanation:
A, B and C are incorrect since the greater the pH value, the more alkaline a solution is, and the pH of water is 7.
In the statement D, the pH of NaOH solution is 13 usually, so the given solution is less alkaline than NaOH solution, and I think of the same concentration is somewhat unnecessary.
Flouroethanol and
sodium hydride is the product
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Answer:
2.123x10⁻⁴ M (mol/L)
Explanation:
First, we are considering the molar mass for each element, a data we obtain from the periodic table:
Ca= 40
S= 32
O= 16
Then, for CaSO₄, the molecular mass is 136 g per mol
As we dissolve 0.00101 g of this salt, we are going to convert this mass in moles units:
1 mol CaSO₄=136 g → 0.0101 g=7.43x10⁻⁵ mol
We finally obtain the concentration for the 350 ml, having in mind that it should be in mol/L:
350ml=7.43x10⁻⁵ mol
1000ml (1L)=2.123x10⁻⁴ M , where M=mol/L
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