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skelet666 [1.2K]

2 years ago

8

Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she use to produce th

e hydrogen she needs? NaOH and oil Zn and KOH H2SO4 and CaCO3 Mg and HCl

2 answers:

WITCHER [35]2 years ago

4 0

Answer:

Mg and HCI :)

Explanation:

ale4655 [162]2 years ago

3 0

Answer:

Mg and HCI

Explanation:

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barxatty [35]

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$[Pb^{2+}]=3.9 \times 10^{-2}M$

this is the concentration required to initiate precipitation

Explanation:

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Ip>Ksp

Precipitation starts only when solution is supersaturated because solution become supersaturated then it does not stay in this form and precipitation starts itself only solution become saturated.

This usually happens when two solutions containing separate sources of cation and anion are mixed together and here also we are mixing lead (||)nitrate solution(source of lead(||)) into the Cl- solution.

$Ip=[Pb^{2}][2Cl^-]^2=Ksp$

$Ksp=2.4\times 10^{-4}$

lets solubility=S

$[Pb^{2+}] = S$

$[Cl^-]=2S$

$Ksp=[Pb^{2+}]\times [Cl^-]^2$

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