Solid calcium hydroxide is dissolved in water until the pH of the solution is 10.88. The hydroxide ion concentration [OH-] of the solution is:

7.6 10-4 M
1.3 10-11 M
1.5 10-3 M
3.8 10-4 M

idk i’m struggling too

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.