Solutions Soluti tion on Defi finition: ion: A solution is a - - PowerPoint PPT Presentation

Day 2 Program Solutions

 Soluti

tion

• n Defi

finition: ion: A solution is a homogeneous mixture of two or more

• substances. A solution may exist in any phase.

 Soluti

tion

• n Example

les: s: An example of a solid solution is brass. An example of a liquid solution is aqueous hydrochloric acid (HCl in water). An example of a gaseous solution is air.

 Solute is a substance dissolved in another

substance

 The Solvent

t does the dissolving.

 I can’t believe

ve I ate the whole thing

 Working

ing with Solutions and why that’s not always s ideal

 Time to Go Green

en

 Ouch!!!

h!!! How Do Suns nscreens creens Work?

 Potentiometric/Colorimetric

Titrations

 Th

The e Pr Problem em: A large drug store wants to market its own brand name antacid. Before they can sell the product, S2S scientists will check the test batches for potency. We will determine the amount of active antacid product by titration.

 Learn How to assay a commercial Over The

Counter (OTC) Antacid product containing CaCO3

 Learn the Use of:

 pH meter (potentiometric)  pH Indicators (colorimetric)  titration equipment

 Titration Curves & Equivalence Points

Antaci cid d Ex Experi rime ment nt

Water r Ethanol nol Mixtur ure

 Prepare and explore various

physical properties of solutions

 The Problems:

• How do cold packs and hand warmers work?
• Why does 1+1 not always equal 2 when mixing

solvents

 Define the terms:

• Solute
• Solvent
• Solution
• Ideal solution
• Non- Ideal Solution

 Solutions are prepared by dissolving a solute into

a solvent

 Certain physical properties of solutions depend

• n the particular solute and solvent

 Solutions can be ideal or non-ideal  Temperature is a measure of the energy present

in a solution

 The Pr

Problem em: Develop a more effective sunscreen.

 Hy

Hypoth thesis esis: To understand how sunscreens work, an understanding of how UV radiation interacts with molecules is necessary. Scientists have found that specific types of

• rganic molecules can absorb UV light. We

will examine UV absorption properties of the active ingredients in commercial sunscreens then develop our own product.

 Determine if sunscreen molecules are UVA or

UVB absorbers, or both by using

• UV Spectrometer
• UV absorbing beads

 Based upon your data, you will select two

sunscreen molecules to prepare your own sunscreen and test it against other commercial sunscreens with SPFs of 15, 30, and 50.

 The Probl

blem: em: More than 670 billion CD’s have been sold worldwide. In an effort to cut down on environmental impact, Time Warner and Sony have commitments to reduce energy consumption and utilize recycled materials in their manufacturing operations.

 Hy

Hypothesi

• thesis: We can determine which products

are made from polystyrene and are possible resources for our recycled CDs. We can look at physical properties like solubility and density and then determine its molecular weight

 Explain and describe polymers

and plastics

 Explain the recycling process  Identify polystyrene materials

from unknowns using density and solubility

 Determine suitability as raw

materials for the manufacturing

• f CD covers by determining the

relative viscosity and molecular mass

 I can’t believe

ve I ate the whole thing: g: acids and bases ses

 Working

ing with Solutions and why that’s not always s ideal: l: Ideal al Solutio ions ns

 Time to Go Green:

en: recycl cle/ e/ vi viscosity ty

 Ouch!!!

h!!! How Do Sunscreen screens s Work? ? suns nscreens reens

 General information

• General middle school: general
• Science buddies: projects

 Ideal Solutions

• Hot ice: exothermic
• Cold pack from hot ice: endothermic
• Citric acid cold pack: endothermic 2

 Time to Go Green/ Polymers

• Slime: slime
• Polymer experiments: cornell
• Density rainbow: demo ; hands on
• Bouncing ball: polymer ball

 I can’t believe I ate the whole thing/ Acids

and bases

• Disappearing ink: acid base 2
• Cabbage juice indicator: acid base 1

 Sunscreen

• Sunscreen experiments: sunscreen; sunscreen2