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3 years ago

Pick the correct products for the following reaction acid + metal reaction: 2 HNO3 + Co -->

Chemistry

2 answers:

hammer [34]3 years ago

6 0

Answer:

Co(NO3)2 + H2

Explanation:

The full balanced reaction equation of the reaction is shown below;

2HNO3(aq) + Co (s)-------> Co(NO3)2(aq) + H2(g)

One of the properties of metals is that metals displace hydrogen from dilute acids. This property is only exhibited by metals which are above hydrogen in the electrochemical series.

This implies that the ability to displace hydrogen from aqueous solution depends on the reduction potential of the metal. Metals having more negative reduction potentials than hydrogen can displace it from aqueous solution.

Cobalt II having a negative reduction potential of about -0.28 V can displace hydrogen from a dilute acid. Hence the answer.

MrMuchimi3 years ago

3 0

Answer:

2. Co(NO3)2 + H2

Explanation:

Hello,

In this case, we are evidencing a simple displacement reaction wherein the cobalt is able displace the hydrogen to produce cobalt (II) nitrate and gaseous hydrogen as a result of cobalt's higher activity:

$2 HNO_3 + Co\rightarrow Co(NO_3)_2+H_2$

Therefore, answer is 2. Co(NO3)2 + H2.

Best regards.

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Answer: The correct option for the chemical equation $H_3PO_4(aq.)+3LiOH(aq.)\rightarrow Li_3PO_4(aq.)+3H_2O(l)$ is 1.

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Explanation:

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$H_3PO_4(aq.)+3LiOH(aq.)\rightarrow Li_3PO_4(aq.)+3H_2O(l)$

$H_3PO_4$ is a weak acid and hence will not dissociate into ions whereas LiOH is a strong base and will easily dissociate into ions.

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$H_3PO_4(aq.)+3Li^{3+}(aq.)+3OH^-(aq.)\rightarrow 3Li^{3+}(aq.)+PO_4^{3-}(aq.)+3H_2O(l)$

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$2HBr(aq.)+Co(OH)_2(aq.)\rightarrow CoBr_2(aq.)+2H_2O(l)$

HBr and $Co(OH)_2$ are strong acid and strong base respectively, hence they will easily dissociate into ions.

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$2H^+(aq.)+2Br^-(aq.)+Co^{2+}(aq.)+2OH^-(aq.)\rightarrow Co^{2+}(aq.)+2Br^-(aq.)+H_2O(l)$

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$H^+(aq.)+OH^-(aq.)\rightarrow H_2O(l)$

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