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pH Levels
pH levels are the measure of activity of hydrogen.
2,503 Questions
The pH of cornstarch is usually around 7, making it neutral. Cornstarch does not significantly impact the pH of a solution it is added to.
Sugar is not a substance that has a pH value since it is neither an acid nor a base. The pH scale is typically used to measure the acidity or alkalinity of aqueous solutions.
well depending on the concentration of the solution but heres the equation to work it out:
pH= -log[H+]
so if the solution was a 1 mol dm^-3 HCl then:
pH= -log(1)
= 0
Hence 1 mol dm^-3 of HCl is VERY acidic
Remember pH:0 is very acidic/ pH:7 in neutral/ and pH:14 is very basic
What is the pH level of an orange?
The pH level of an orange typically ranges from 3 to 4. This acidic pH level gives oranges their tangy taste.
What substance has a PH level of 7?
Just water.
Actually, there are lots of things that could have a pH of 7, not just water. For example, salt water could have a pH of 7 depending upon what kinds of salts and how much of each kind of salt was in the water.
What are the pH levels of different household liquids?
- Vinegar: pH of around 2-3
- Lemon juice: pH of around 2
- Milk: pH of around 6-7
- Bleach: pH of around 12-13 It is important to note that these values can vary slightly depending on the brand or specific product.
Antacid products having neutral having range near about pH 7-8.6
What is the pH level in bleach?
The pH level in bleach typically ranges from 11 to 13, making it highly alkaline. This high pH level gives bleach its strong disinfecting and cleaning properties, but it can also be corrosive and irritating to the skin and eyes.
What is the pH level of mascara?
Mascara is actually made from acid and can be very dangerous if it comes into contact with the eye ball, people have been known to go blind or even have their eyes fall out.
What is the pH level of Caustic Soda?
A normal or neutral pH level is 7. Caustic soda is highly basic with a pH of between 13.5 and 15. Caustic soda is a dangerous base and should be handled carefully.
What is the normal pH of the stomach?
The normal pH of the stomach is around 1.5 to 3.5. This highly acidic environment helps in the digestion of food and inhibits the growth of bacteria in the stomach.
How does the respiratory system control carbonic acid concentration and pH?
when there is to much carbonic acid the body increases rate and depth of respiration to reduce the co2, which reduces the carbonic acid,(water in the plasma + co2 = h2co3 . when the co2 level goes down below normal levels, respirations slow and become more shallow to retain co2 which increases the carbonic acid, and adjusts the blood ph.
What is the pH level of Dr Pepper?
It's probably got to be somewhere between 1-7! It's most definitely an acid.
The pH is 2.9
A pH of 4 indicates an acidic solution. It means that the concentration of hydrogen ions in the solution is relatively high. Substances with a pH of 4 include some fruit juices and acid rain.
acid pH level is 0-7 and pH of alkaline is 7-14. acid shrinks and alkaline swells the hair. at the higher and lower end of the scale is either dissolves or damages the hair.
the strong acids and alkalies can ruin your hair.
What is the pH level in mountain-dew?
Mountain Dew has about 3.25 ph. Here is a link to a study done. Not professional by any means, but it gets the job done.
http://www.selah.k12.wa.us/SOAR/SciProj2005/Graphs/MarshalN.pdf
What is the pH level of antacids?
The pH level in your stomach is between 2 and 3 which is an acid. The antacids bring the pH level up to a 5 or 6 which is not quite neutral but is still less acidic.
What is the pH level for acetic acid?
The pH level for acetic acid is 3...
The pH level for acetic acid is 3...
Phenolphthalein has a pH of 9.7. It colorless in its acid form. It has a pinkish type color in its basic or normal form.
The stomach contains hydrochloric acid, which has a pH of generally 1-3. These optimal pH levels must be present in order for pepsin (a protein-digesting enzyme) to function. If the pH is not acidic, pepsin will only be present in its inactive form, pepsinogen, and protein digestion will effectively occur. Uhh.. hope that's what you were looking for. The second part is just a bit more detail as to why the pH of stomach is important.
How do you find the pH of a substance?
To find the pH of a substance, you measure the concentration of hydrogen ions in the substance and then take the negative base 10 logarithm of that concentration. The pH scale ranges from 0 to 14, with values below 7 being acidic, 7 being neutral, and values above 7 being basic.
What is the pH level in coffee?
pH level of coffee is 6.9
This is as per mathforum.org. Web ref and text of the posting is included below:
http://mathforum.org/library/drmath/view/63391.HTML
Mixing Coffee and Milk: Ph and BuffersDate: 07/10/2003 at 19:09:51 From: Libby Subject: Ph levelCan you tell me if I did this right?
The question is:
If I mix coffee (pH 6.9) and milk (pH5) (50%/50%), what will be the Ph of the coffee/milk mixture?
I used the formula pH = -log [h+]
pH = -log [.5(10^-5) + .5(10^-6.9)] -pH = log [.5(10^-5) + 10^-6.9)] -pH = log 5.0629^-6 -pH = -5.295 pH = approx. 5.3
Date: 07/10/2003 at 20:10:46 From: Doctor Achilles Subject: Re: Ph level
Hi Libby,
Thanks for writing to Dr. Math.
Given the information you have available, that is the best approximation. However, this method makes two assumptions:
1) That you are mixing equal parts coffee and milk. If, for example, you were to mix 3 parts coffee to 1 part milk, then you would have to weight your average appropriately.
2) That neither the coffee nor the milk has any buffers in it. A buffer is something that resists changes in pH. Here are the basics of how a buffer works:
pH is a measure of the concentration of free H+ ions in solution. An acid is a chemical that releases H+ ions and a base is a chemical that traps H+ ions.
The simplest type of acid is a "strong acid." HCl (hydrochloric acid) is a typical example of a strong acid. In a strong acid, every hydrogen is immediately released as an H+ ion when you put it in "aqueous" (mostly water) solution. So if you put HCl in aqueous solution, every HCl molecule will dissociate (separate) into an H+ and a Cl-. So if you add 100 trillion HCl molecules, you will effectively have added 100 trillion H+ ions.
There are also "strong bases." NaOH (sodium hydroxide) is a typical strong base. For a strong base, every molecule of base you add will take a proton out of the solution. What happens in the case of NaOH is actually a 2-step process. First, the molecule dissociates into Na+ and OH-. Then the OH- finds an H+ and they get together to make HOH, which is more commonly known as H2O, or water. This effectively removes one H+ from the solution.
Now, there are also "weak acids." In a weak acid, only some fraction of the molecules will add an H+ to the solution. A good example of a weak acid is phosphate (H3O4P). The difficult part about weak acids is that what fraction of the molecules actually *do* add an H+ to the solution depends on the pH of that solution. If the pH is low (therefore a high concentration of H+ ions), then a small fraction of weak acid molecules will release an H+ ion. If the pH is high (a low concentration of H+ ions), then a large fraction of weak acid molecules will release an H+ ion. What that means is that weak acids are very weak when you put them in something that is already acidic, and they are pretty strong when you put them in something that is basic.
If you turn that logic around, if you have a weak acid that is at some pH, and you try to add a base to increase the pH, the weak acid will just respond by releasing more H+ ions, and thus keep the pH relatively constant. Similarly, if you try to add acid to decrease the pH, the weak acid will just take back some of the extra H+ ions and thus keep the pH relatively constant. So, weak acids can act as bases. In fact, there isn't really a distinction between a weak acid and a weak base; they are both called "buffers." If you add H+ ions to a buffer, then it will respond by taking some of them up, and if you remove H+ ions, it will respond by releasing them.
Buffers aren't perfect, of course, and you can "saturate" a buffer by forcing it to give up all its hydrogens or take up all the H+ ions it can hold. And even a not-quite-saturated buffer can exist over a fairly wide range of pH values.
Buffers are essential for survival. Your body has to maintain all its fluids at a constant pH; even one or two tenths of a pH unit of change can be *extremely* damaging. So all of your fluids have a mixture of several different types of buffers.
So what does this have to do with milk and coffee? The analysis you used works only if all the acids and bases in the milk and coffee are "strong." However, both milk and coffee have buffers. Milk has more. My guess is that this will cause the pH of the mixture to tend toward the pH of the milk. How much depends on what buffers are in each and what the dynamic ranges of those buffers are. That I can't tell you off hand. The way I would answer the question is to measure the pH of the mixture. Your other option is to analyze the milk and coffee to find the concentrations of all the buffers and then look up their dynamic ranges and relative buffering capabilities, which is a very difficult task.
Hope this helps. If you have other questions or you'd like to talk about this some more, please write back.
- Doctor Achilles, The Math Forum http://mathforum.org/dr.math/
