Tip & How-To about Measuring Tools & Sensors

Using a pH meter to care for your fish

PH values are the acidity of a body of water. Neutral water has a value of 7.0 meaning that it has equal amounts of hydrogen ions and hydroxide ions. When more hydrogen ions are added the water then the number goes down and the water becomes more acidic, or if the amount of hydroxide ions goes up then the water becomes more alkaline.

pH levels in your fish tank can prove to be fatal if they aren't monitored properly. While there is no secret formula for the perfect pH level for all fish it is best to keep all the fish from the same bodies of water together. Salt water fish shouldn't be put in a tank with freshwater fish because they need different pH levels.

Throughout the day the pH level of your fish tank will change although these slight changes shouldn't be too harmful on your fish sudden changes will prove to be fatal. When you are moving fish from one tank to another you want to make sure that the two waters have the same pH levels. When you want to buy a new fish check the pH level of your fish tank and then the pH level of the water at the pet shop to make sure that the levels are not too different.

You should be checking the pH levels of your fish tank at least once a month, but more often is always better. When you take the pH level you should write it down in a log book. You should try to take the pH level at the same time every time you take a reading because at different times of the day the levels would be different. Try to keep yourself from going crazy, if the pH level is a few decimals off of perfect your fish will be okay. If the level is fairly regular you shouldn't have to do anything unless your fish show signs of distress.

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3 Answers

What pH levels are good for you?

The way that pH levels work is that a low number is bad, equal to 7 is neutral and more than 7 is good.

Jan 05, 2014 | Measuring Tools & Sensors

2 Answers

what does pH stand for?

the p stands for potential and the H stands for Hydrogen, and it refers to the ability to attract hydrogen ions.

Jan 28, 2013 | Measuring Tools & Sensors

1 Answer

Explain the relationship between pH and relative concentration of hydrogen and hydroxide ions in a solution

The pH scale is a logarithmic scale used to measure the concentrations of hydrogen/Hydronium ions in an aqueous solution.
If c[H] is the concentration of hydrogen ions in mol/L, the pH is defined as
Inversely, the concentration is given by
The pOH=14-pH

Jan 19, 2012 | Office Equipment & Supplies

1 Answer

TI-30XIIs How to calculate pH

pH is defined as the negative logarithm of the hydrogen ion activity in a solution:
The value mib8888_32.gif is defined as the molar concentration of H+ Ions, multiplied by a correction factor, the activity coefficient. The activity coefficient is required because in nature there are rarely actual H+ ions in a solution. For example, in water H+ ions combine with water molecules to Oxonium and Hydronium ions:
The associated products are less reactive than H+ ions would be, so the activity coefficient is always greater than 0 and smaller than 1. It depends on plenty of factors, e.g. the temperature of the solution, or the presence of other substances, and is very difficult to determine precisely.

For this reason, in water solutions the pH is usually approximated by:
for other solutions (not in water), similar approaches exist, but the resulting "pH" equivalents are not directly comparable.

Long story short: get the H3O+ concentration in mol/L by measuring it, or from the problem text. For example, if the concentration is 0.003 mol/L, key in:
and get a pH of 2.52

Feb 02, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

antilog in chemistry problem

pH is minus (log to base 10) of the hydrogen ion activity of an aqueous solution, or (log to base 10) of (1/hydrogen ion activity)

To get the inverse log, i.e the hydrogen ion activity corresponding to a specified pH, simply enter the pH value and press


Answer 0.001

Apr 22, 2008 | Texas Instruments TI-30XA Calculator

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