<span>(0.1875 moles)(98.004 g/mole) = 18.37575 g </span>
<span>In correct number of significant figures: 18.4 </span>
Answer : The pH of calcium acetate solution will be 9.38.
Explanation : When calcium acetate dissocates completely in solution to form Calcium(+2) ions and two acetate ions, this gives the acetate ion concentration as
(2 X 0.51 M) = 1.02 M
Acetate ion then hydrolyzes as follows;
:
Now, Kb will be = ![[HC_{2}H_{2}O_{2}] [OH^{-}]](https://tex.z-dn.net/?f=%20%5BHC_%7B2%7DH_%7B2%7DO_%7B2%7D%5D%20%20%5BOH%5E%7B-%7D%5D)
/ ![[C_{2}H_{3}O_{2}^{-}]](https://tex.z-dn.net/?f=%5BC_%7B2%7DH_%7B3%7DO_%7B2%7D%5E%7B-%7D%5D%20)
= Kw / Ka
= 1 x 
/ 1.8 x 
= 5.6 × 
![[OH^{-}]](https://tex.z-dn.net/?f=%20%5BOH%5E%7B-%7D%5D%20)
= 2.4 ×
Now, we know , pOH = -log = 4.62
So, the pH = 14 - pOH = 14 - 4.62 = 9.38
Calcium reacts gently with water to give hydrogen and calcium hydroxide, which is only slightly soluble, thus slows down the reaction.
It will be assumed that hydrochloric acid used is a dilute aqueous solution.
However, calcium reacts with hydrochloric acid to give calcium chloride which is readily soluble in water, and hydrogen, being a typical reaction of relatively active metals with acids.
Ca(s) + 2HCl(aq) -> CaCl2(aq) +H2(g) ↑ + heat
The clues that it is a chemical reaction could be:
- formation of a new substance, gaseous hydrogen
- disappearance of a metallic solid in the solution
- heat formed during the vigorous reaction.
As silver is below hydrogen in the electrochemical series, it will not be expected to react with dilute hydrocloric acid. (however, it dissolves in oxidizing acid such as nitric acid, but not displacing hydrogen as a product).
Answer:metal coil
Explanation: i took the quiz for middle school
