Acid

Question: acid.....? has anyone tried it? and if so how are the trips? what are they like?

Answer: acid ranges from person to person and who you are with. also you need to make sure you have a good quality acid if you don't the strick nine will hurt your back in the morning and you feel like shit for days. your trips can range from range from bright colors to energies out the ass. its all about you some people trance out it also depends on your surroundings...

Question: When titrating acids and bases, why do you rinse the pipette with acid solution before titration? Before you but the acid that you are using for the titration, you first rinse with water for obvious reasons, then you rinse with an acid acid solution (or the same acid solution that you are using? I don't know). So why would you do this?? I had to do this for an experiment I conducted in class, the instructions said to do this. I am not sure of the reasoning behind it.

Answer: You usually rinse the BURETTE. But in either case, it is to make sure no water is left in the apparatus which wd dilute your titration, giving you an erroneous result. If the pipet is wet, rinse it with the sample being tested. If the burette is wet, rinse it with the titrant. That will result in only sample being titrated with the only titrant, both at full strength.

Question: How can you tell a strong acid/base from a weak acid/base just by looking at its chemical formula? Im trying to figure out the difference between weak acids/bases from strong acids/bases in my chem class. I know that strong acids/bases ionize completely, while on the other hand, weak acids only partially ionize. If i take two chemicals like HCL and HC2H3O2, how will i tell which one is a strong acid or weak acid just looking at their chemical formulas? Thx for the help.

Answer: the Stronger one is the one with the least chemical compounds or elements

Question: Why does adding hydrochloric acid to an aqueous solution of a carboxylic acid decrease its solubility in water? A) The added acid makes the solution more ionic B) The added acid shifts the acid dissociation equilibrium in the direction of the non-polar protonated form of the acid. C) The added acid makes the carboxylic acid dissociation constant, Ka, smaller. D) The added acid makes the carboxylic acid dissociation constant, Ka, larger. E) The added acid influences the kinetics of solubility not the thermodynamics. Please provide explanation, as to why you chose an option, and why the others are incorrect.

Answer: B) The added acid shifts the acid dissociation equilibrium in the direction of the non-polar protonated form of the acid.

Question: Is mandelic acid good for getting rid of acne and acne scars? Has anyone had any good results with mandelic acid? Would it be a good idea to use a glycolic acid toner and apply a mandelic acid serum? Which brands do you recommend?

Answer: I'm not sure..check out this blog, 1 user says it is good. http://www.acne.org/messageboard/index.php?s=b424a8cc31c9d723e305d159cebe271b&showtopic=192204&pid=2238074&st=0&#entry2238074

Question: How much citric acid is in an orange and in a clementine? My daughter gets diaper rash from oranges. I was wondering if clementines had less citric acid. I am looking for the exact amount of citric acid in an orange and the exact amount of citric acid in a clementine. Thanks!

Answer: There is about 79% citric acid in an orange and 52.5% in a clementine and 91.7% citric acid in a lemon. Clementines have less citric acid.

Question: How do you calculate percentage of acid when it is undissociated? A weak acid has a pKa of 7.335. If the solution pH is 8.192, what percentage of the acid is undissociated? A weak acid has a pKa of 4.435. If the solution pH is 4.72, what percentage of the acid is dissociated?

Answer: Assuming this is a monoprotic acid (if it's di- or tri-protic, you'll need to use an alpha fraction equation), then you can simply set up an ICE table, where you're looking at a Ka equation. Since you know the pH of the solution, you know [H3O+] and you can use an the ICE table to find the concentration of the undissociated (HA) form. You know that the concentration of A- and H3O+ must be the same, so you only have one unknown. For example... HA . + . H20 ... --> A- ... + ... H3O+ x ......... -- ... ... 10^(-pH) ... 10^(-pH) Ka = ([A-][H3O+])/([HA]) Now that you know both [A-] and [HA], you should be able to calculate the fraction of dissociation.

Question: How is percent dissociation of an acid related to the Ka value for the acid? How is percent dissociation of an acid related to the Ka value for the acid (assuming equal initial concentrations of acids)?

Answer: Percent dissociation = amount ionized/ original amount times 100 The Ka is used to find [H+] (if its given to you) and the H+ is your "x" or your amount ionized. The original amount is the initial concentration of the acid.

Question: How to draw the structural formula to amino acid peptide? I'm confused by what my microbiology teacher wants me to do with the following problem: "Consider the following peptide: lysine-valine-threonine- cysteine-leucine-proline- gluamine-glutamic acid-aspartic acid-tryptophan, with lysine as the amino-terminal acid and tryptophan as the carboxy-terminal amino acid in the peptide. Draw out the complete structural formula of the peptide and determine the overall ionic charge on the peptide at pH 7.0. Charge at acid pHs? Charge at alkaline pHs?" Can someone help me figure out how to draw this structure and figure out the ionic charges?

Answer: http://web.indstate.edu/thcme/mwking/amino-acids.html From the above link, you can check the structures of all your amino acids. You will see that for all your amino acids, there is an amino terminal (this is your -NH2) and your carboxylic terminal (-COOH). In peptide bonds, the amino terminal of one amino acid (it becomes =NH3+) is bonded to the carboxylic end of your next amino acid (which becomes -COO-). When you say that lysine is your amino terminal acid, this means that the -NH2 of lysine is free and is not bonded to another amino acid. it is the carboxylic end of lysine that is bonded to the amino terminal of your next amino acid, valine. Then valine's carboxylic end is connected to the amino end of threonine...so on and so forth...That is why your tryptophan is your carboxy-terminal amino acid because its carboxylic acid side is not bonded.

Question: Whats the difference between carboxylic acid and acetic acid? They look like they have the same structure? Im doing SN1 reactions and have acetic acid as a possible solvent but am not sure if carboxylic acid would be as well or how theyre different! Please help!

Answer: hey, Acetic acid has the structure Ch3-COOH. It is a type of a carboxylic acid. The structure of Carboxylic acid is R-COOH. where the R group is a carbon with different connectivity. As far as which solvent you have to use, you have to determine which solvent is a better nucleophile. since in the first step of an SN1 reaction the leaving group leaves such as Br-, and your left with a carbocation. IN the next step your nucleophile attacks the electrohpile (the Carbocation). You goal is to form the most stable product.hope this helps.

Question: What happens when a strong acid and strong base are combined in a neutralization reaction? A.The products in the reaction will be acidic with a pH of less than five. B.The acid donates protons to the base to form the products. C.Water and an insoluble covalent compound are formed. D.The OH- is transferred from the acid to the base. E.A new base and acid will be formed.

Answer: Water and salt will be formed Afaik. Although most salts are soluble in water, so none of the answers seem right (C is closest though).

Question: How long will a lead acid motor vehicle battery in new dry charged state last before filling with the acid? For instance,if you had one (empty of acid) in the boot with the container of acid,as insurance of a flat battery in remote areas,how long before the dry charged effect deteriorated to the point of non-useability.

Answer: a new dry lead acid battery should last up to 10 years. I always order batteries that are serviceable dry. Then I fill them upon being sold. you could also drop a note to one of the battery makers and put forward your question. www.exide.com www.usbattery.com www.surrette.com

Question: How many moles of acetic acid should be added to 1 L of a solution to make a buffer? How many moles of acetic acid should be added to 1 L of a solution containing 0.40 mole of sodium acetate in order to make a buffer solution with a pH of 3.80. The pKa of acetic acid is 4.76. Disregard any volume changes due to the added acetic acid. Can you please show me and explain how to do this?

Answer: 3.80 - 4.76= - 0.96 10^-0.96=0.110 = 0.40/ moles acetic acid moles acetic acid = 3.6

Question: What is the molar concentration of the acetic acid in this case? A quantity of 0.18 M hydrochloric acid is added to a solution containing 0.11 mole of sodium acetate. Some of the sodium acetate is converted to acetic acid, resulting in a final volume of 843 mL of solution. The pH of the final solution is 4.62. (a) What is the molar concentration of the acetic acid? (b) How many milliliters of hydrochloric acid were added to the original solution? (c) What was the original concentration of the sodium acetate?

Answer: 4.62 = 4.74 + log [acetate]/ [acetic acid] 10^-0.12 = 0.759 = [acetate]/ [acetic acid] [acetate]= 0.11 -x / 0.843 L [acetic acid ]= x / 0.843 L 0.759 = 0.11-x/x 0.759 x = 0.11 - x 1.759 x = 0.11 x = 0.0625 = moles HCl added [acetic acid ]= 0.0625/ 0.843 = 0.0741 M Volume HCl = 0.0625/ 0.18=0.347 L = 34.7 mL 843 - 34.7=808.3 mL initial concentration acetate = 0.11 / 0.8083 L=0.136 M

Question: Is the citric acid used in laboratories the same as used to make bath bombs? I've recently bought some bath bombs and I am so in love with them!! So I want to make some and was about to order some citric acid for the recipe, when my mom told me she also had citric acid in her laboratory, where she works, and could just get me a bit from there (I only need like 4 ounces). It's the powdered form, but is it the same thing? Because I can imagine that something used in laboratories shouldn't be good for your skin, right?

Answer: There is only one kind of Citric acid. I wouldnt use your mums for making sherbet or fizzy drinks but for a bath bomb it should be fine. Have fun!

Question: How would I find out the moles of acid present? I performed a titration of an acid with NaOH. 0.300 g of an unknown acid+50ml of water is the solution that was titrated. I also used 26 ml of NaOH for the titration, which when calculated, it turned out to be 1.38 moles. I don't think the moles of acid present is the same as the moles of acid used right? Like I suppose I couldn't just convert the 0.300g to moles? Thanks!

Answer: moles NaOH = 1.38 = moles unknown acid 0.300 g of unknown acid => 1.38 moles note : I do not thing that your date are correct moles NaOH = 0.026 L x molarity NaOH