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

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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catya that's not even a b or c