The sulphate ion has a charge of 2-, and potassium has a charge of 1+. To fully neutralise the charge on a sulphate ion, you need two potassium ions.
However, strontium has a charge of 2+. To neutralise the sulphate ion's 2- charge, one strontium ion is enough, so only one bonds to the sulphate.
Hope I helped! xx
Non-polar because hydrophilic means something can be wetted by water
Filling in the blanks, the full sentence is: Robert Boyle made the biggest impact on science by <span>writing out the scientific method for all of science.
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The scientific method is the standard method of knowledge pursuit.</span><span> It involves careful observations,</span><span> formulating </span>hypotheses<span> (based on observations); preparation of </span>experimental<span> testing, and the measurement and interpretation of results</span>.
Sodium hydrogen carbonate has:

The + from Na+ and + from H+ makes 2+, and therefore the 2- from CO3 evens the charges to neutral.
Not to be confused with Sodium Carbonate, (Na2CO3), which lack an H, Sodium Hydrogen Carbonate is sometimes shortened to just Sodium Bicarbonate. It is used in the kitchen (cooking) as "baking soda."
Formula: NaHCO3