Question

The flower color of bigleaf hydrangeas is determined by the soil's pH. A gardener growing blue hydrangeas believes that lime may be leaching out of a nearby sidewalk and increasing the pH of the soil. The gardener measures the hydrogen ion concentration and finds it to be 0.0000006 moles per liter. What is the pH and what color are his colors likely to be?

the blue- 5 the purple - 5.5 the pink - 6

Answer 1

pH is calculated by the negative logarithm of the hydrogen concentration in a solution. Therefore, the pH in this case is:

pH = -log (0.0000006)
pH = 6.22

Therefore the correct answer among the choices is the last option, pH of 6 with a color pink.