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An excess of sodium hydroxide is treated with 26.5 L of dry hydrogen chloride gas measured at STP. What is the mass of sodium chloride formed?

A) 1.55 kg

B) 1.69 g

C) 0.138 kg

D) 69.1 g

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Alyssa Mae Remarim
Alyssa Mae RemarimLv10
9 Jan 2021

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Why did the cobalt precipitate out of solution as sodium hydroxide was added?

A. The cobalt chloride underwent a double displacement reaction and insoluble cobalt hydroxide was formed.

B. The cobalt chloride underwent a double displacement reaction and insoluble sodium chloride was formed

C. The acidic nature of the sodium hydroxide caused the cobalt to precipitate

D. Cobalt undergoes transmutation in the presence of a strong base

Why is only 1 drop of NaOH in molar excess of the concentration of cobalt chloride sufficient to cause a color change?

A. The cobalt hydroxide turns blue when it interacts with excess sodium hydroxide.

B. The cobalt chloride acts as a buffer, absorbing hydrogen ions. When the cobalt chloride is depleted, there is no buffering and the hydrogen ions cause the solution to become more acidic.

C. The cobalt chloride acts as a buffer, absorbing hydroxide ions. When the cobalt chloride is depleted, there is no buffering and the hydroxide ions cause the solution to become more basic.

D. The cobalt hydroxide turns blue when it interacts with thymolphthalein.

The color change and the precipitation occur in which order:

A. The color change occurs after all of the precipitation.

B. The precipitation occurs after the color change.

C. The precipitation occurs both before and after the color change.

D. The color change occurs simultaneous with the precipitation.

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