How would you make up 75 ml of a 45 mg/ml BSA solution?

see below

Explanation: for 75 ml, take 45*75 mg of BSA and make up to 75 mL with distilled water.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)