Ph Alkali acid?

PH is a scale used to quantify the acidic, in relationship to the alkalinity, content of a substance...or vice versa

A ph of 7 would be neutral, neither acidic nor alkaline...distilled water would have a ph of 7...

Below 7 becomes more acidic, above 7 becomes more alkaline...

The acidity or alkalinity of a substance is dependent on hydrogen ion activity, so that the lower on the scale you go the less activity there is...For each number up the scale you go, the H⁺ (hydrogen ion) activity increases 10 fold...The scale runs from as low as -5 to a high of about 14... However pH is actually a shorthand for its mathematical definition: in chemistry a small p is used in place of writing − log₁₀ and the H should more correctly be [H⁺], standing for concentration of hydrogen ions.

Do you want to get into the mathematics deeper ?

No its ok I think I now better understand only thing why hydrogen is what chages pH value. How this works? I think I know how scale works but notr so sure about the hydrogen? My chemistry is not so good on this thing. You are being helpful.

The pH label means, "the negative logarithm to base 10 of the hydrogen+ [H+] ion concentration in moles per litre".

Substances with a lot of free H+ in solution are acids.

Substances that reduce the H+ ion concentration are usually 'alkaline', containing a lot of hydroxide- [OH-] ion.

Your answer is ok for person that has knowledge but me I ask because I know very little of these things I try to lern but it is no so easy when you get complcated.

As you can see my english he is not so good and yoiu know so much better this subject.

I never use logarithum calkculator is all I know. What is mole?

Like I say I go and look up wikipeadia but it is too complicated. I need nioce simple explanation. I am sure there must be a better way for you to explane to me.

Please I dont wont to waste your time. Orteze

Let's take a crack. I'll stand correct or corrected by the others...

An alkali solution (say, water and sodium hydroxide) has a lot of spare electrons (-e) that can take part in chemical reactions with other things. On the other hand, acids (say, nitric acid) have a lot of spare protons (H+) that can take part in chemical reactions with other things.

So alkalies rip protons off of other materials and acids rip electrons off of other materials. That's why when you mix an alkali with an acid they tend to neutralize each other.

Make sense???

Eemmm.. nice explaination.

Let me just add that Hydrogen consist of one photon and one electron. When some how the hydrogen losses its electron it will become some what like a single photon (and acts like one too).

Eemmm...Nice explanation,

"Photon?"...

Wangito

proton

Yeah, proton. Sorry for the spelling.

CLoud

http://en.wikipedia.org/wiki/Mole_%28unit%29

Simply, the mole is the same number of atoms or molecules of a substance as there are in 12 grammes of Carbon₁₂.

Water [H₂O]: 18 grammes per mole

Carbon dioxide [CO₂]: 44 grammes per mole

Hydrogen [H₂]: 2 grammes per mole

Benzene [C₆H₆]: 78 grammes per mole

Thank you I now need to go and take some sleep but you have been good at showing me the easy explanation. Thanx for your help I am one up on the rest of my class now.

My chemistry is rubbish but I thought pH was short for 'potential for Hydrogen' , the logarithmic scale just being a convenient one for expressing the concentration of Hydrogen ions ? The word 'potential' seems more suggestive of a chemicals reactivity.

Feel free to make me pay for my lack of attention to Chemistry many years ago !

Kris

Get a copy of PH and solubility calculations by Buttler. The best book on the subject to a certain extent.

S

Simply there is no alkali acid. Alkali would general comprise basic (pH greater than 7 upto 14) solutions of either potassium or sodium, commonly used to describe solutions of sodium or potassium hydroxide. Acids would be pH less than 7. pH is a negative logarithmic expression of the ionic concentration of hydronium ions in a aqueous solution. e.g. pH of 7 is 10^(-7) moles of H+ per liter of water.