Given [h3o+] = 1.00 x 10-7m
is this acidic, basic or neutral?
how do you know?

This solution is neutral.

Assumption: the solution is under room temperature, such that .

Explanation:

For a solution in water,

.

In other words, if is given, knowing the concentration (in , or equivalently ) of either or will imply the concentration of the other ion.

Under room temperature,

.

The question states that for this solution,

As a result, the concentration of in this solution will be

.

A solution is acidic if .A solution is basic if .A solution is neutral if .

In this case, . In other words, this solution is neutral.

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na