why does light intensity affect pH?
359316
Light intensity affects pH because a substance's acidity is affecting by the amount of heat that is exerted on it, which is light intensity in a way.
739516
The light intensity is inversely proportional to the SQUARE of the distance.\n\nUse this formula:\n\nEarth sunlite * Earth dist. ^ 2 = Mercury sunlite * Mercury dist. ^ 2\n\n1400 * Earth dist. ^ 2 = Mercury sunlite * 5.7e10 ^ 2\n\nYou use multiplication, not a proportion, because the relationship is inverse. \n\nRadagast is wrong in three ways. First, the proportion is INVERSE, not direct, so we use multiplication, not division. Second, the relationship depends on the square of the distance, not the distance itself. And third, he means similar triangles, not congruent ones.\n\nRadagast's formula will give you lower light intensity on Mercury than on Earth, clearly nonsense.
860365
use the equation  pH= -lgKa+ lg( salt/acid)\n(this equation only applies for buffer system)
698411
It would result in an increase of the pH of the aqueous solution.
1066669
we know that pH is ranged from totally basic to totally acidic, with neutrality (water) being at pH=7; so just display a range from 0 to 14 and color code it (red for acid and blue for basic) and place your findings there (ie before and after situations of NaCl towards the pH of the solution). Also place analogies (ie. the results of the pH due to NaCl concentration of 10% is equivalent to household ammonia)\n\nWhen explaining something to a non-science person, visuals and analogies always helps.
529894
Intensity refers to the number of photons.  Concentration is the number photons/unit area, so what the smarties who've answered this question mean is, no, you can't increase the number of photons, you're just making them bounce off something (like a ball would), they're not multiplying in number.  Instead, you're increasing the number of photons in the area, making it moer concentrated.  In fact, do a thought experiment with a number of balls bouncing off a semicircle of walls.  They'd all hit close to the same place, but there'd still be the same number.
353441
Refraction occurs when light enters two substances of diferent densities. It bends because the mass of the two substances are different ie, the spacing of particles are different.
556259
strong acids have a high tendency to donate protons (hydrogen ions) and strong bases have a high tendency to receive them.  \nstrong acids have a very low pH, 1-3\nweak acids have a ph of about 3-6\npH 7 - neutral solution\nweak bases have phs of about 8-11\nstrong bases - ph 11-14
1098425
ph meters are designed to check the power of Hydrogen in a substance. The scale runs from 1 (extreme acid) to 14 (extreme caustic). You cannot check the concentration of a a substance, such as how much acid or caustic is ion a solution. To find that, you have to titrate for the concentration.
791993
well theres alot of material i can provide you with but i dont know what particular experiment you are designing as there are always different experiments within an experiment.\nanyhow, i think this is an example of an experiment for photosynthesis and respiration and their pH levels.\n\nhttp://www.science.siu.edu/plant-biology/plb337/old_st_papers/emmert.pdf \n\n\nif you are doing the same experiment, i guess you will find this one really helpful.\n\n.. Good Luck
844268
how were you measuring the pH? if it was a pH meter maybe it wasn't calibrated correctly/ recently?? or if it was with litmus paper.... maybe it went bad? I'm not sure if it can... check and see if there could have been an expiration date. i don't think temperature would have that drastic of an effect unless you did the experiment at pH7 and a seriously high (like about 60C) temp and the other ones at room temp or 37C (body temp)... sorry i cant help anymore then that, that's very strange!
164592
sun light - the photons break the covalent bonds between the hydrogen and oxygen
208500
Perhaps the plants transpiration processes of; photosynthesis, CO2, & nitrogen along with other conditions, ie. H2O temp., Ph level, UV length of intensity play a part of the chemical transformation of plant material to become reddish in color.  Ideally, a micro nutrient of Fe (iron) would make a difference but not certain.
440553
Because you mention Rf values, I assume you're asking specifically about Thin-Layer Chromatography.  Actually the molecular weight is a fairly minor factor in the Rf value.  Intermolecular interactions between the pigment in question and the solid phase and the mobile phase are the most important.  So it really comes down to the selection of the mobile phase, how polar, how acidic or basic in relation to the analyte (your pigment in this case).  pH of the mobile phase is critically important in that your pigment may ionize to a greater or lesser extent depending upon the pH, and this drastically changes the intermolecular interactions.  Stationary phase selection is also important.
455471
pH (potential hydrogen) is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. In aqueous systems, the hydrogen ion activity is dictated by the dissociation constant of water (Kw = 1.011 × 10−14 at 25 °C) and interactions with other ions in solution. Due to this dissociation constant a neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered alkaline..\n\npH = -log(concentration of H+)\njust use the equation to figure it out.\nhttp://en.wikipedia.org/wiki/PH
448790
Alkalinity is usually measured by the presence of bicarbonate (HCO3-) and carbonates (CO3=) and acts to buffer water from acidic inputs, thus is a measure of the buffering capacity of water. Water with high alkalinity have high pH values while water with low alkalinity have low pH values. The hardness of the water is usually determined by the amount of calcium and magnesium salts present in water and is associated with the presence of carbonates. Hard water is generally more productive than soft water waters and can accept more input of salts, nutrients, and acids to their system without change than can soft water waters. So basically, it’s because of the presence of the magnesium. \n\nHope this helps and hope I didn’t confuse you.
921604
theoretically yes 10m acid has a pH of -1, and 10 moles of base pH 15.\n\nBut , in fact, for very high concentrations, you must not take in account the concentration of ions H+ but the activity . The actvity takes in account the high concentration and is \n\nactivity = gamma * pH where gamma is lower than one for high concentrations