====== Acid and Bases ====== ===== Acid ===== * Acidic in taste * Acids disassociate one proton (H+) at a time * Types of acids: Monoprotic((1 H+)), Diprotic((2 H+)), and Polyprotic((many H+)) * **Bronsted-Lowry Acids** are important and they donate H+ in water ===== Base ===== * Bitter/poisonous * Slippery when wet * Most cleaners are basic == **alkaline** * **Bronsted-Lowry Bases** are similar to their acid counterparts, they accept an H+ ===== Strong vs Weak Acids and Bases ===== * Strong acids/bases completely ionize or disassociate in water, weak ones do not * Less than 1% of a weak acid/base will dissociate Note: Weak acids are extremely dangerous, HF on your skin will put amputation in your near future. ==== Strong Acids ==== * HCl * HBr * HI * HlO4 * H2SO4 * HNO3 ==== Strong Bases ==== All group I + II Hydroxides are strong bases((examples include LiOH, NaOH, Ca(OH)2, Ba(OH)2, etc.)) ===== Amphiprotic ===== Also called Amphoteric, these are ions that behave as either acids or bases. Water is an example of one. ===== pH scale ===== pH is a logarithmic scale to measure the acidity of a solution. Acids are between 0-7, bases are 7-14, and an exact value of 7 represents a neutral substance. ==== Calculating pH (and pOH) ==== These equations can be used to calculate the pH of a substance. pOH is useful for determining the basicness of a solution. * $\text{pH} = -\log{H^+}$ * $\text{pOH} = -\log{OH^-}$ Taking the inverse log(($10^x$ or $\log{x}^{-1}$)) can return the amount of H+ and OH- as indicated by the formulas above. * $H^+ = 10^{-\text{pH}}$ * $OH^- = 10^{-\text{pOH}}$ ==== Relationship between pH and pOH ==== Since the pH scale goes between 0 and 14, $\text{pH} + \text{pOH} = 14$. Also, using the rules in the section above, it can also be determined that $H^+ \times OH^- = 1 \times 10^{-14}$. This all assumes that the temperature is **25 °C**. You can still use this if the temperature isn't stated.