Ca 2+ ( calcium ions ) are stored in the smooth endoplasmic reticulum.
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Calcium ions are stored in the endoplasmic reticulum of cells, as well as in specialized organelles called the sarcoplasmic reticulum in muscle cells. When needed, these ions can be released into the cytoplasm to carry out various cellular functions.
The ionic compound formed by Ca2+ and F- ions is calcium fluoride.
Having an excess of Ca2+ ions helps ensure that all the CO32- ions in the solution react with Ca2+ to form the calcium carbonate precipitate. If there is a higher concentration of Ca2+ ions compared to the CO32- ions, it increases the likelihood of complete precipitation and minimizes the risk of having leftover CO32- ions in solution. This excess of Ca2+ ions helps drive the precipitation reaction to completion.
For every one molecule of Ca3N2, there are 3 calcium ions. Therefore, in 2.8 mol of Ca3N2, there would be 2.8 mol * 3 = 8.4 mol of Ca2+ ions.
In an aqueous solution of CaBr2, the solute particles are Ca2+ cations and Br- anions. When dissolved in water, CaBr2 dissociates into these ions, which are responsible for conducting electricity and other properties of the solution.
The spectator ions are the ions that do not participate in the chemical reaction and remain unchanged on both sides. In this reaction, the spectator ions are Ca2+ and CO32- from CaCl2 and K2CO3, since they appear unchanged in the final products.