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How do I calibrate the ph on a Rolachem RC25-7

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Haw do i calibrate metller toledo mp220 ph metter


All pH meters require calibration standards to ensure that the readings are traceable to a standard. Always choose a pH 7 buffer plus at least one other pH value close to your expected measurement range. Using solutions of known pH value allow you to adjust the system to read accurate measurements. Calibration should be performed before each reading or each set of readings.
After that this model has auto buffer select and it will tell You what buffer you put it in , also will ask if you want to correct it as well

Dec 05, 2014 | Measuring Tools & Sensors

1 Answer

I have a Zodiac pH Perfect controller installed in my pool since one year. It measures the pH as it should, but the controller does not correct the pH at all. I think it has been correct installed, and...

in order for the controller to function, you will have either a CO2 or acid container. make sure that it is full. otherwise, nothing will happen. if they are full, make sure that the valves are open to the container

Jun 04, 2014 | Zodiac BARRACUDA G3 IN-GRND CLEANER

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

1 Answer

The ph part on my test strips is brite pink why?

pH Scale
Examples of solutions on the pH Scale compared to distilled water are set out below:
  • pH = 0 => Battery Acid which is very strong Hydroflouric Acid
  • pH = 1 => Hydrochloric Acid secreted by stomach lining
  • pH = 2 => Lemon Juice, Gastric Acid, Vinegar
  • pH = 3 => Grapefruit Juice, Orange Juice, Soda
  • pH = 4 => Tomato Juice, Acid Rain
  • pH = 5 => Soft Drinking Water, Black Coffee
  • pH = 6 => *****, Saliva
  • pH = 7 => "Pure" Water
  • pH = 8 => Sea Water
  • pH = 9 => Baking Soda
  • pH = 10 => Great Salt Lake, Milk of Magnesia
  • pH = 11 => Amonia Solution
  • pH = 12 => Soapy Water
  • pH = 13 => Bleach, Oven Cleaner
  • pH = 14 => Liquid Drain Cleaner such as "Draino"

pH Scale Numbers
This scale is logarithmic. It means that each number is 10 times stronger than the preceding number. For example, a pH of 2 is ten times more acidic than a pH of 3 and one hundred times more acidic than a pH of 4. It is important to monitor pH because live depends on it. For instance, human blood is basic with a pH between 7.3 and 7.5. If the pH of blood drops below 7.3, acidosis occurs. If the blood pH rises above 7.5, alkalosis occurs. Death will occur if blood pH goes below 7.0 or above 7.8. Our human existence depends upon a balanced and buffered blood pH.

so u should seek medical attention

Jul 03, 2012 | Flents Universal pH Test Strips - For...

2 Answers

Do we need to calibrate the pH meter every time we measure an acidic solution or alkaline solution?

No I have a hanna phep for my koy pond I never calibrate it just clean it in fresh water every use shake it in water

Feb 28, 2011 | Hanna pHep pH Meter with Solutions

1 Answer

How to fix ph and hardness in my above pool

Best Answer - Chosen by Asker First of all, I would NOT recommend you use muriatic acid as some people mention, unless your pH or alkalinity are extremely high. This is highly dangerous acid, and if you put in too much, then good luck getting your pH back up again.

You need to test your water with test strips, a droplet test, or bring it into your local pool store and they can test it for you. They should tell you at least your alkalinity, pH, and chlorine levels.

You want to make sure your alkalinity is balanced BEFORE you balance your pH. Alkalinity and pH are related - if your alkalinity is not stable (stable generally means it's between 80 and 120 parts per million or ppm), then your pH will be jumping up and down.

Once your alkalinity is between 80 and 120 ppm, then work on balancing your pH. As long as your pH is between 7.2 and 7.8, it is within a good range. If your pH is 7.8 or higher, you can buy pH decreaser or pH minus at the pool store. On the back of the container, it will tell you how many grams to put in, according to how many litres in your pool. If your pH is extremely high, like at least 8.5-9, then you could consider putting in muriatic acid.

If your pH is too low, you can buy pH increaser or pH plus and put that in your pool. Again, the container will have helpful instructions on the back of it. pH increaser is basically sodium bicarbonate (aka baking soda) so if you're hard up for cash, I've heard of some people just dumping baking soda in their pool. However, pH increaser is definitely better quality so I would recommend that first.

It's really that simple. If pH is above 7.8, dump in some pH decreaser. If it's below 7.2, dump in some pH increaser. You can buy them for under 10 bucks each at many pool stores.

Aug 09, 2010 | Intex Automatic Salt Water System for ...

1 Answer

How do I calculate pH from H+ concentration on a ti 30a? [H+] 1.2 x 10 -5 M = ? pH = 4.9 I worked out pH to concentration but struggling for the opposite figured it out once and...

You calculate the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c[H+]= 3.57x10^(-6)
pH: (-) [LOG] 3.57 [2nd][EE] [(-)] 6 [ ) ]
Here you have 2 change sign key press [(-)]

If you have the pH, and want to calculate the concentration that yields that value of the pH you proceed as follows
c= 10^(-pH)
Ex pH=8.23
c: [2nd][LOG] [(-) 8.23 [)]

General shortcut.
If concentration is of the form c[H+]= 1*10^(-a) where a is an integer between 0 and 14, the pH is equal to the positive value of exponent.

Ex:c[H+]=1x10^(-5) Mol/L then the pH is just the positive value of the exponent, ie 5 because pH=-log(1.x10^-5) =- log1 -log(10^-5)=0 -(-5)=5
Above I use the rule log(axb)=log(a)+log(b) , the rule log(a^b) = b*log(a)and the facts that log(1)=0 and log(10)=1, the last being true if log stands for log in base 10.

May 20, 2010 | Texas Instruments TI-30XA Calculator

1 Answer

What are the steps to solving for pH?

What do you mean by solving for the pH?
Do you have the concentration? if YES, you CALCULATE the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c= 3.57x10^(-6)
pH: (-) [LOG] 3.57 [2nd][EE] [(-)] 6 [ ) ]
Here you have 2 change sign key press [(-)]

If you have the pH, and want to calculate the concentration that yields that value of the pH you proceed as follows
c= 10^(-pH)
Ex pH=8.23
c: [2nd][LOG] [(-) 8.23 [)]

Here is a screen capture to show you both calculations


Apr 25, 2010 | Texas Instruments TI-84 Plus Calculator

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