# 4.10 Relative Strengths of Acids and Bases

4.10 Relative Strengths of Acids and Bases Chemistry 12 4.10 In this lesson we will look at the relative strengths of some weak acids and use their Ka values to explain how they would behave when they

are combined. 4.10 E.g. 1a) Write the Bronsted-Lowry acid base equilibria for the following reactants. HPO4 2- + HCO3H2PO4- + CO32- amphiproti c

Can only act as a base 4.10 E.g. 1b) What side is favoured? H2PO4- + CO32- HPO4 Ka = 6.2 x10-8

2- + HCO3- Ka = 5.6 x1011 Larger Ka value means that H2PO4- is better at producing H+ 4.10

E.g. 1c) What is the stronger base? H2PO4- + CO32- HPO4 2- + HCO3- A stronger acid is ALWAYS on the same side as the stronger base CO32- is the stronger base

4.10 E.g. 2 a) Using 2 amphiprotic reactants HSO4- + H2PO4- SO42- + H3PO4 HINT: Use your B-L table, as the reactant with the larger Ka will behave like an acid. 4.10 E.g. 2b) What side is favored?

HSO4- + H2PO4- SO42- + H3PO4 Ka = 1.2 x10-2 Ka = 7.5 x10-3 the products are favoured 4.10 E.g. 2c) Stronger base? HSO4- + H2PO4- SO42- + H3PO4 Stronger acid

Stronger base 4.10 E.g. 3) What is the Bronsted-Lowry acid base equilibria that results from the following reactants? Both reactants NaHSO4 + NaH2PO4 NaHSO4 Na+ + HSO4NaH2PO4 Na+ + H2PO4- dissociate and Na+

is a spectator These are our reactants HSO4- + H2PO4- SO42- + H3PO4 You should notice that this is really the same question as example 2. Learning Check

When given 2 weak acids can you determine which one will act as the acid and which one will act as the base? Can you identify whether the equilibrium favours the reactants or the products?

Can you do the above with amphiprotic substances? Salts? 4.10 Read & Highlight Self Notes (p. 6 12) Problems Hebden # 38-46

## Recently Viewed Presentations

• HILL PDA concluded that a 30% uplift on the then market value of properties would incentivise home owners to sell, and that with a base FSR of 2.75 : 1 development would occur. At that time this equated to average...
• The DD Form 1348-1A is an approved form of sub-custody for non-expendable A&E. It is the preferred method of sub-custody for security, dummy, and inert A&E from the Ammunition Chief to the Armory. Reference: MCO 8010.13, enclosure (1), chapter 5....
• Background. What do we mean by "Transitions"?: The transition from school to adulthood for children with SEN or disabilities. The provision of advice and information about what can be done to meet or reduce the needs they are likely to...
• Ridicule those who appeal to it (as "legalist," "fundamentalists," "intolerant," "bigoted," etc. Ridiculed! "And even if we did have only Christians in our midst, if we expelled every non-Christian from the United States of America, whose Christianity would we teach...
• Persyaratan Lomba. Tiap timberanggotakan 2 orang dari sekolah yang sama. Peserta merupakan WNI dan belum pernah tinggal di Jepang lebih dari 6 bulan.
• Herbalife Employee Other titles Lucida Grande ヒラギノ角ゴ Pro W3 Arial MS Pゴシック NBL-UN_Crp_NonPhoto_10x7_p2 1_NBL-UN_Crp_NonPhoto_10x7_p2 A Budget Program B Advanced Program C Ultimate Program
• Higher Close Reading Imagery What it's Not! Imagery does not mean 'descriptive writing' eg Down on the level, its pink walls, and straggling roses, and green-painted rain barrel hidden by a thick dusty planting of spruce and larch, was Fin-me-oot...
• risk. area. for . fraud. and. corruption. and. these. usually. result. in . the. misuse. of public . funds. Supreme Audit Institutions(SAIs) audit the use of public funds and, depending on mandates, may also audit compliance with principles of sound...