A GMJ - m Period Date 5 Version Acid Bases PhET WetfLib for Chromebooks HTML BE SURE TO USE https: //phet.colorado.edu/en/simulation/acid-base- solutions Click to begin. Part 1: Procedure g;:s 0 . Use each 1. The lab has 2 tools that allow you to test for pH values: A probe and pH paper one by dipping it into the solution to be tested. Try al! the given types of solutions and fill in the Data Chart with the pH value 0-14. Name W — 2. The circuit with a battery and bulb as shown: : iis the tool used to test for conduction of a solution. By dipping the wire leads into the solution, the bulb with either remain unlit, be dimly lit, be somewhat bright or very bright . Test each solution and record your observation for the bulbs brightness in the chart below. \ Part 1: Data pH Value from Probe 509^ Color & pH Value from pH Paper Observations from Circuit Tool Describe the brightness 4-. oo m |gfiM a - DO Strong- Acf \l 31 ' & 13.. oD s ** «© ^ SKAJL- ‘TSo Weak Base V ffe*prv\r - Lp WHS [OH ] a irjrH + ' a m HU * ] b zfi ll sn »>w [ £- * SSL it II x rt* o o u pH fiOH ” 14 - pH * - pH “ 14 pOH pOH concentration of the solution is given before any ionization or dissociation takes place. ; pHI7ipO | ' 2. Fill in the missing concentration values for the hydronium and hydroxide ions on the chart her l sp the concentration ^^ -\oc ^ 5 io £. 10° c: value for [H30 +] to calculate the pH. Show work: ( l oO re> } * -O wI * -’ 10 & i 1 10* C 4pU) = <1> s ' :m l JIT y . . . :i ;i ) -* . mT i j13 - r . .. iff ®; - mvT 8 8 j * . * X Iff 4 .r i i ' _ mm * ; •* « - »i .2 s q to 5! 3. Use the concentration value for [Off ] to calculate the pOH. Show work: 1ff ? *i iff81 e§ £ 2 H20 "•v ^ H30+ + OH- 4. Did your answer to #2 match the pH given in the simulation? \ p V- UpO (\X ) Show work: 2 p% 5. Is the answer to #3 equal to: (14 - pH)? lp\ 6. Is the solution an acid a base or neutral, based upon the calculated pH? " !,,1L . r I10 J ) V - f ZpW) ~ ~4 , ~ HONORS ONLY : Attach notebook paper to show calculations for the pff and pTJH forlhe other solutions. 9 i4 r0u SCJ tXvW VsL ' f ^ ^ ^L HONORS ONLY: Part 3 Procedure, Analysis , Conclusion: My Solution . The default setting shows a weak acid with a Across the bottom of the screen, click the concentration of 0.010 M. Insert the pH probe to show an initial pH of 4.50. The beaker is shown below: 1. Slide the initial concentration bar to the right to increase the number of solute molecules and then slide it to the left. What effect does changing the concentration have on the pH value? (Be specific) ij i VW. CcvTML^ “ ( ^ ckiL UUUXS C 7Y"\ \ L - C “N * * p \\ *A ryjr VN VOoTS^ S \ >V ^ ^ a. * i - IWDYC ^ --eVA3 to see how the concentrations rise and fall. -AVML ooc* uxv vWt?Jn tnr~>s oA' A c t n e A H j D+ \ ( 2X) ^ (\ pO 3.(ga? No? Does the pH seem to depend upon the concentration of [H30 ] ions? + and move the slider to 4. We always assume that strong acids will 100% ionize in water. Click reset strength: strong. Insert the probe. Record pH. Observe the number of ions in the beaker and click to observe the concentrations. 2,DD ( a. pH Value = b. YES or NO? Did the beaker contain a particles that now has 0% concentration? If so , what particle seems missing? . Why is it likely missing? C \ pO fVPs \ OYV lx S > <"4-0 Tv Ji \\ p\ rv xAe 1A * A~ _ So ~Vv \G.v iu fs, y^ o \"se Ne -AA - - - " . and change to a base. Repeat 1- 4 above and answer the questions. 5. Click reset #1: What effect does changing the concentration of the base have on the pH? Be specific. " V\ Cl Y- CV 4JX S O CiSI * " CL\ \ t> A CAY~\ycc\n pV?) +V'\JL " ' " r \A ^ ' " \ 4o ~ #2 : a . How do the # of OH and ~ "TY-VJL lit D -£ (. Zp ) ^ f /o v P t? ’ S> i O. CJV-UUXSJ^ BH+ uoa- H and B change as you increase strength? Be specific. iZH * ic>Y^ s> i r ' Cv^LCvyx roo\ f C CXS, - groove- V^ S » Ov4 ZijcVt CV-T) as you increase strength_?_Be_specific. b. How does the concentration of OH ' ' \\ S rx.v\ ~ ~ QJ VXSX- S < ^ * #4: We always assume that strong bases will 100% ionize in water. Click reset wand move the slider to strength: strong. Insert the probe. Record pH. Observe the number of ions in the beaker and click to observe the concentrations. /V\) V If so, what is it ? b. Is there a particle missing? vj C * i . x’: s increase the pH ? concentration initial the increasing , op can For Bases NO ? 9. YES ’ cWcrfUa Extension: In to find the ion concentration. Make a data chart to record ion concentration, initial concentration and strong/weak and acid/base. For each, use the concentration to calculate pH. Dip the probe to verify pH. — Q p-Vb - JOVISC- Dl\ \o JpiZ _. IQ n— % m z YV\ JLS*. - — _ ~ - on ^ \ m -a pOWr \ opx. ^ Cn^ q - 5T lbL^JrUX \ V~\Q -5L LPH) " ^ pCiV t UYoJZ S YpP) 3 : 3 \ b X- ) D ~ ~ Vo ( 3 I U*- * o b ) ) 2 pW * \ WL \ . -\ m -^ 4 .s p« -srOA Ip - M S f o-ntOi ' ' r. Y r ^ J > jA jj (pt>v\ ^

Acid Bases Lab

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