Question

Why would we say that a solution with a H+ concentration of 1.00x10^-7 M is said to be neutral?

Answer 1

Arrhenius model of acids and bases. This model states molecules in water that release hydrogen ions (H+) are acids, while molecules in water that release hydroxide (OH-) are bases. This is not complete. The current common definition of an acid and a base is based upon how the substance releases or attracts hydrogen ions (H+). Acids release H+ ions that can turn neutral molecules into positively charged ions, while bases can attract H+ ions from neutral molecules to produce negatively charged ions. This definition allows for bases such as ammonia which does not contain a hydroxide ion.

In water solutions, acids affect water molecules, producing hydronium (H3O+) and bases also affect water molecules, producing hydroxide (OH-) ions. The relative strength of acids and bases is measured by their respective ion concentrations once dissolved. The product of the hydronium ion (H3O+) concentration in water times the hydroxide ion concentration equals 1*10 to the -14th power. When water is not the solvent, the product of the concentrations of the positive and negative ions produced by acids and bases also has a constant value, but the value is different for each solvent.

In water solutions, the pH is equal to the negative log of the hydronium ion (H3O+) concentration. The pOH is equal to the negative log of the hydroxide ion (OH-) concentration. For typical solutions, pH varies between 0 and 14, with 7 (the pH of water) as neutral. Each "step" below 7 is ten times more acidic (since it was derived from a power of ten). For concentrated solutions (> 1 M) of strong acids or bases, solutions can have pH below 0 or above 14 respectively. However, considering the water system at 25 °C, the pH plus pOH of a substance is equal to 14.

Answer 2

hey here is your answer
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H+ concentration of 1.00x10^-7 M
then,
pH = -log (1.00 × 10^-7)
= -log (10^-7)
= -(-7) log 10 ......log 10 = 1
= 7 × 1
= 7
since the pH of the solution is 7 then it is said to be a neutral solution .
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