Classifying Solutions Essays - Solutions, Equilibrium Chemistry

Classifying Solutions Essays - Solutions, Equilibrium Chemistry Classifying Solutions Types of Solutions Gas Solid/Gas Liquid/Gas Gas Solid Solid/Solid Liquid/Solid Gas Liquid Solid/Liquid Liquid/Liquid Gas Solution-a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent) Solvent- A substance that can dissolve another substance, or in which another substance is dissolved into Solute-The minor component in a solution, dissolved in the solvent Aqueous-contains water Alloy-a solid solution or two or more metals Solubility-The maximum amount of solute that will dissolve in a given quantity of solvent at a specific temperature Saturated Solution-a solution that cannot dissolve more solute (contains maximum amount of solute at which the solution exists) Unsaturated Solution-a solution that could dissolve more solute (contains less solute than the maximum amount possible is dissolved in the solution) Supersaturated Solution-a solution that contains more dissolved solute than a saturated solution at the same temperature Determining the type of solution -Add a seed crystal of solute -Dissolves= unsaturated -Does not dissolve= saturated -Begins to crystallize= supersaturated Solubility Expressed in grams of solute per 100g of solvent Solute Solubility (g solute/100g solvent)Qualitative Solubility description Less than 0.1Insoluble 0.1>1Slightly Soluble 1-10Soluble 10Very soluble e.g. A 3.20g sample of a salt dissolves in 9.10g of water to give a saturated solution at 25*C. What is the solubility (in g salt/100g of water) of the salt? Solute = 3.20gSalt = x _ Solvent 9.10gH2O 100gH2O x=3.20gSalt(100gH2O) 9.10gH2O x=35.2g Factors that Affect Solubility Forces that act between the particle of the substances in solutions: -forces that attract particle of the solute to each other -forces that attracts particle of the solute to particles of the solvent -forces that attract particles of the solvent to each other Solubility in Water -The polar nature of water molecules enables water to dissolve a wide range of solutes -Most ionic compounds are soluble in water 1.Electrical attraction between the polar water molecules and the ions pulls ions from the surface of the solute 2.Polar water molecules surround the separated ions in a process called hydration, and ions disperse uniformly in solution Polar compounds dissolve in water Nonpolar compounds dont dissolve in water Nonpolar compounds can dissolve in nonpolar solvents Conductivity of Aqueous Solutions Solutions of ionic compounds can conduct electricity. Temperature and Solubility (Solid in Liquid) For most ionic solids, solubility increases as temp increases. Temperature and Solubility(Liquid in Liquid, Gas in Gas) Temperature change has little effect on the solubility of one liquid in another one or one gas in another Temperature and Solubility(Gas in Liquid) The solubility of a gas in a liquid decreases as the temperature increases Pressure and Solubility(Gas in Liquid) The solubility of a gas in a liquid is directionally proportional to the pressure of that same particular gas above the liquid Factors that Affect Rate of Dissolving -agitation or mixing(stirring) -temperature increases -increased surface area of the solute Concentrations of Solutions as a % Concentration-the ratio of the quantity of solvent or the quantity of solution Concentrated-having a high ratio of solute to a solution Dilute-having a low ratio of solute to solution % (Mass/Volume) -a ratio of the mass of solute to the volume of solution, expressed as a percent %(m/v)=m of solute (g) x100% v of solution (mL) % (Mass/Mass) -a ratio of mass of solute to mass of solution, expressed as a percent %(m/m)=m of solute (g) x100% m of solution (g) % (Volume/Volume) -a ratio of the volume of solute to the volume of solution, expressed as a percent %(v/v)= v of solute (mL) x100% v of solution (mL) ex.(m/v but applies to all % questions) g:msolute=17.5g msolvent=350mL r: %(m/v)= ? a: %(m/v)=msolute x100% msolvent m: =17.5g x100% 350mL =5.00% [3 sig digs] Very Small Concentrations of Solutions Parts per million (ppm) -a ratio of solute to solution x106 ppm=m of solute (g) x106 m of solution (g) Parts per billion (ppb) -a ratio of solute to solution x109 ppb=m of solute (g) x109 m of solution (g) ex.(ppm but same steps for ppb) g:mNaF=32.2mg=3.22x10-2g mH2O=20.0kg=2.00x104g r: ppm(m/m)= ? a: ppm(m/m)=mass of solute x106 mass of solution m: ppm(m/m)=3.22x10-2g x106 2.00x104g+3.22x10-2g =1.61ppm(m/m) Molar Concentrations -the amount in moles of solute dissolved in 1L of solution equation: C= n/V ex. Molar concentration g:c=0.154mol/L V=500mL=0.500L r:n=? m=? a:n=cV m:n=0.154mol/L(0.500L) =0.077mol m=Mn =(22.989770g/mol)(0.077mol) =1.77g ex. Molar concentration of ions g:n=0.212molFeCl3 V=0.175mL r:c=? a:c=n/v m:c=0.212molFeCl3/0.175mL =1.21mol/L Determining Solubility Effect of Ion Charge -compounds of ions with small charges tend to be soluble -compounds of ions with large charges tend to be insoluble -why? Increasing ion charge increases the attractive forces that hold the ions together Effect of Ion Size -the size of an atom is different than the size of its corresponding ion -in general, metallic ions tend to be smaller than their corresponding neutral atoms; non-metallic ions tend to be larger than their corresponding neutral atoms -small ions bond more closely

The Background of the Battle of Lepanto

The Background of the Battle of Lepanto The Battle of Lepanto was a key naval engagement during the Ottoman-Habsburg Wars. The Holy League defeated the Ottomans at Lepanto on October 7, 1571. Following the death of Suleiman the Magnificent and ascent of Sultan Selim II to Ottoman throne in 1566, plans commenced for the eventual capture of Cyprus.  Held by the Venetians since 1489, the island had largely become encircled by Ottoman possessions on the mainland and offered safe harbor for corsairs that routinely attacked Ottoman shipping.  With the end of a protracted conflict with Hungary in 1568, Selim moved forward with his designs on the island. Landing an invasion force in 1570, the Ottomans captured Nicosia after a bloody seven-week siege and won several victories before arriving at the last Venetian stronghold of Famagusta.  Unable to penetrate the citys defenses, they laid siege in September 1570. In an effort to bolster support for the Venetian fight against the Ottomans, Pope Pius V worked tirelessly to construct an alliance from the Christian states in the Mediterranean. In 1571, the Christian powers in the Mediterranean assembled a large fleet to confront the growing menace of the Ottoman Empire. Assembling at Messina, Sicily in July and August, the Christian force was led by Don John of Austria and contained vessels from Venice, Spain, the Papal States, Genoa, Savoy, and Malta. Sailing under the banner of the Holy League, Don Johns fleet consisted of 206 galleys and 6 gallasses (large galleys that mounted artillery). Rowing east, the fleet paused at Viscardo in Cephalonia where it learned of the fall of Famagusta and the torture and killing of the Venetian commanders there. Enduring poor weather Don John pressed on to Sami and arrived on October 6. Returning to sea the next day, the Holy League fleet entered the Gulf of Patras and soon encountered Ali Pashas Ottoman fleet. Deployments Commanding 230 galleys and 56 galliots (small galleys), Ali Pasha had departed his base at Lepanto and was moving west to intercept the Holy Leagues fleet. As the fleets sighted each other, they formed for battle. For the Holy League, Don John, aboard the galley Real, divided his force into four divisions, with the Venetians under Agostino Barbarigo on the left, himself in the center, the Genoese under Giovanni Andrea Doria on the right, and a reserve led by lvaro de Bazn, Marquis de Santa Cruz in the rear. In addition, he pushed gallasses out in front of his left and center divisions where they could bombard the Ottoman fleet. The Fleets Clash Flying his flag from Sultana, Ali Pasha led the Ottoman center, with Chulouk Bey on the right and Uluj Ali on the left. As the battle opened, the Holy Leagues gallasses sank two galleys and disrupted the Ottoman formations with their fire. As the fleets neared, Doria saw that Uluj Alis line extended beyond his own. Shifting south to avoid being flanked, Doria opened a gap between his division and Don Johns. Seeing the hole, Uluj Ali turned north and attacked into the gap. Doria responded to this and soon his ships were dueling with Uluj Alis. To the north, Chulouk Bey succeeded in turning the Holy Leagues left flank, but determined resistance from the Venetians, and the timely arrival of a gallass, beat off the attack. Shortly after the battle began, the two flagships found each other and a desperate struggle began between Real and Sultana. Locked together, Spanish troops were twice repulsed when they tried to board the Ottoman galley and reinforcements from other vessels were needed to turn the tide. On the third attempt, with aid from lvaro de Bazns galley, Don Johns men were able to take Sultana killing Ali Pasha in the process. Against the wishes of Don John, Ali Pasha was beheaded and his head displayed on a pike. The sight of their commanders head had a severe impact on Ottoman morale and they began withdrawing around 4 PM. Uluj Ali, who had success against Doria and captured the Maltese flagship Capitana, retreated with sixteen galleys and twenty-four galliots. Aftermath and Impact At the Battle of Lepanto, the Holy League lost 50 galleys and suffered approximately 13,000 casualties. This was offset by the freeing of a similar number of Christian slaves from the Ottoman ships. In addition to the death of Ali Pasha, the Ottomans lost 25,000 killed and wounded and an additional 3,500 captured. Their fleet lost 210 ships, of which 130 were captured by the Holy League. Coming at what was seen as a crisis point for Christianity, the victory at Lepanto stemmed Ottoman expansion in the Mediterranean and prevented their influence from spreading west. Though the Holy League fleet was unable to exploit their victory due to the onset of winter weather, operations over the next two years effectively confirmed a division of the Mediterranean between the Christian states in the west and the Ottomans in the east.