The chemical formula for an unknown metal (M) carbonate is determined to be MCO3Which of the following elements could be M?

Question

BlackTom AI · Accepted Answer

The question presents a carbonate with formula MCO3 and asks which element could be M. In carbonate compounds, the carbonate ion has a 2− charge (CO3)2−, so to balance the overall charge, the metal M must typically be in a +2 oxidation state (M2+). This points to metals in Group 2 of the periodic table (the alkaline earth metals) such as Mg, Ca, Sr, Ba, etc., all of which commonly form MCO3 compounds. In particular, calcium forms calcium carbonate, CaCO3, which is a well-known, common mineral.

Since the provided answer indicates M is Ca (calcium), this is consistent with the requirement that M be a divalent cation capable of forming a stable carbonate salt. Calcium’s +2 charge aligns with the carbonate’s 2− charge, leading to a neutral compound: Ca2+ + CO3 2− → CaCO3.

Because the list of answer options is not shown in the prompt, I cannot comment on each specific alternative, but I can explain why Ca fits the general rule: a +2 oxidation state and the ability to form stable carbonates is characteristic of Ca as well as other Group 2 elements. If an option such as Mg, Sr, Ba, or Pb(II) appeared, those could also be plausible M values since they also commonly form MCO3 compounds, albeit with varying solubilities and stabilities. Conversely, elements that do not prefer a +2 oxidation state, or those that form different anions or do not form stable carbonates, would not be suitable choices.

In summary, MCO3 requires a M2+ cation for charge balance, and calcium (Ca2+) is a textbook example of such an ion, making Ca a correct and reasonable choice for M in this context.

The chemical formula for an unknown metal (M) carbonate is determined to be MCO3Which of the following elements could be M?单项选择题

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