Ignoring wind resistance, if a cannon were to shoot the same cannonball at the same speed, which angle would result in the lowest height? 10 degrees
25 degrees
57 degrees
82 degrees

1 molar (M) solution is equivalent to the 1 mole of the compound present in 1 litter or 1000 mL of the solution. Thus 1.27 M (molar) solution represent 1.27 mole of K₃PO₄ present in 1000 mL of the solution. Thus 343 mL of the solution contains ×343 = 0.435 mole of K₃PO₄. Now K₃PO₄ is a strongly ionic salt which dissociate in solution as K₃PO₄=3K⁺ + . Thus 1 mole of K₃PO₄ produces 3 moles of K⁺ ions.

Thus, 0.435 mole K₃PO₄ produces (3×0.435) = 1.305 mole of K⁺ ion.

Thus 343 mL of 1.27 M K₃PO₄ solution contains 1.305 mole of K⁺ ions.