i would like to know how acidic or alkaline soils are. know  also the reason  why they vary especially in the tropics
134293
soil pH typically varies on a much smaller scale than country or climate zone.  Here in the Blue Ridge Mountains, some valleys have acid soil ("sour" to the old-school farmers who didn't have a meter fancier than their tongue) while over the next hill it may be "sweet," that is, neutral to basic.  Here it depends on the kind of rock under the soil.
372670
B.Clay\nClay is generally particles < 2 micrometres, sand somewhere around 100 micrometres, and gravel rather in the millimetre range.\n\nA. wind erosion\nToday's (Tuesday, 14th Nov 2006) weather news show nice satellite images with dust vanes across the Canary islands. Forecasts say that some of the fine dust might even reach South America with the Passat winds. The seas before the Sahara have high sedimentation rates of desert dust.\n\nD. O-horizon\nO for organic.
383680
sand is small pieces of rock that has been eroded away from a larger stone.it would take years to get a few pounds of sand from a 25 pound rock but wind rain and snow will break down the rock to produce sand. soil is dirt formed from leaves and twigs from trees. all this will decay and produce soil along with rain and other dying vegetation.go into a densely wooded area and you will find soil.be sure its a hardwood forest.that means maples oaks and other varieties of trees but not conifers, conifers are of the pine family and fir all evergreens.the foilage dropped this fall will take about 2 1/2 to 3 years to decay enough to be soil which is the best for growing flowers and bulbs
76621
Yea, the first answer is right.  Among many other factors, soils are made up of parent material that has decomposed.  It mostly depends on what kind of rock they came from.
106466
www.recobio.com/soil-remediation.html\n\nwww.engg.ksu.edu/hsrc/JHSR/vol2no7.pdf\n\ngulliver.trb.org/publications/millennium/00090.pdf
403886
Well.... you can make a universal indicator by heating up red cabbage in boiling water...remove the cabbage and the solution that remains will be a different color when placed in solutions of varying pH.  You would have to add water to the soil sample to mix it with the indicator.
607969
the easiest way is to use a pH paper to test the pH. and just compare the reading with the one given with the test kit. \n\nOr you may do some neutralisation. And then calculate with the  amount of alkali you use for neutralisation. By that you can calculate the concentration of hydroxide ions in the alkali that you use. Then calculate the pOH for the alkali you use. pH=14 - pOH.\neg. \n1mol of NaOH gives you 1 mole of OH ions.\nso the pOH = -log1 = 0\npH = 14 - 0 = 14\n\nJust some rough guide. Hopefully it helps...Good luck.
460005
try using www.chemtutor.com, it helps you understand those kind of problems
476390
The pH of the salt depends on the strengths of the original acids and bases:\n\nAcidBaseSalt pH\nstrongstrongpH = 7\nweakstrongpH > 7\nstrongweakpH < 7\nweakweakdepends on which is stronger\n\nThat should be what you want.
672800
No.  Any salt has a pH of 7.  Any acid has a pH of less than seven.  They're contradictory.  If you mixed some acid and some salt, I wouldn't call it salt any more.  I'd call it acid.
240635
High pH means fruits of alkaline in nature.Some are as follows-\nApples \nPersimmons \nThompson Grapes (Seedless) \nMuscat Grapes \nAll Sweet Grapes \nFresh Figs \nDates \nFigs \nRaisins \nPrunes \nApricots \nPeaches \nBananas \nCherries \nBananas \nLitchi "Nuts" \nCarob \nAll Dried Fruit
262242
Two reasons:\n\n1.)  Chemical reactions tend to increase with temperature; the same would be true for chemical weathering.\n\n2.)  Save for deserts, warm areas tend to be rainier, and a warm, wet climate makes for rapid weathering.
73638
pH is the measure of acidity or basicity(alkalinity) of a solution. When pH increases, the solution is more alkaline and when pH decreases the solution is more acidic. A pH of 7 implies that the solution is neither basic(alkaline) nor acidic but neutral. Check the answer to one of the similar questions on Yahoo answers at the following page.
241998
Alfisols, Aridisols, Entisols, Histosols, Inceptisols, Mollisols, Oxisols, Spodosols, Ultisols, Gelisols, Andisols, and Vertisols. \n\ngo here little one\nhttp://soils.ag.uidaho.edu/soilorders/orders.htm\n\nand here\nhttp://www.enchantedlearning.com/geology/soil/
347810
While determining actual pH is more involved, saying whether a solution of a salt is acidic or basic is often easy.  The rule is:  The salt of a strong acid and weak base is acidic.  The salt of a weak acid and strong base is basic.  The salt of a strong acid and strong base is neutral.  (With a weak acid/weak base, you need pKa/pKb values to tell).  So,\n\nKNO2: basic\nNH4NO3: acidic\nNa2O: basic (hydrolyzes to produce NaOH)\nNaClO4: neutral
429157
1.  F  acids have pH < 7\n2.  T\n3.  F  Cations are positive, anions are negative\n4.  T\n5.  F  Crystal lattices formed by ionic bonds\n6.  F  When atoms are "destroyed", the reaction is nuclear...molecular changes are chemical.\n7.  F  Metal elements donate electrons and form cations\n8.  F  Ion with + charge has lost electrons\n9.  F  prevent foods from reacting with oxygen.
168930
Some plants thrive in a low pH-leveled soil (such as rhododendrons and azaleas), and other kinds of plants thrive in a high pH-leveled soil.  Give the plants the opposite of what they need, and they will mostly likely die.