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At pH 12, magnesium hydroxide is insoluble and does not react with EDTA. The titration of a hard water sample at pH 12 thus yields results for calcium only. A 250.0-mL sample of tap water was adjusted to pH 12 and titrated with 0.01049 EDTA using calcein indicator, requiring 21.77 mL to reach the endpoint. A 200.0-mL sample of the same tap water required 47.86 mL of the standard EDTA for titration at pH 10 using calmagite indicator. Calculate the molar concentration of Mg2+ in the tap water
oxygen molecules absorb uv radiation of wavelength less than and equal to 242 nm calculate the frequency and energy of the least energitic of these photons.
The stratospheric ozone layer helps to protect us from harmful ultraviolet radiation. It does so by absorbing ultraviolet light and falling apart into an molecule and an oxygen atom, a process known as photodissociation.
Benozoic Acid has a Ka = 6.3*10^-5. A 35.0mL sample of 0.130 M Benzoic Acid is titrated with 0.150M NaOH solution. Find the pH after 0.0mL NaOH is added.
What is the solubility of Pb3(PO4)2 in a 0.025 M Na3PO4 solution? The solubility product for Pb3(PO4)2 is 1.0 x 10^-54.
In Organic lab we are enabling trans to cis isomerizaton of E-1,2-dibenzoylethylene by irradiating the alkene with UV light.
which is the stronger acid HCL or HBR and which is the stronger base Cl or Br?
How many grams of water can be cooled from 34°C to 26°C by the evaporation of 81 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g·K.)
What would happened if HCl was accidentally used instead of Na2CO3 to extract caffeine from tea bags? Would you be able to fix your mistake. How
When Fe(NO3)3 is dissolved in water, hexaaquiron(III) ions, Fe(H2O)6 3+, forms. Fe(H2O)6 3+ ions hydrolyze in aquesous solution accoring to the equation given below
Hydrogen atoms that are bonded to an sp3 hybridized carbon atom normally appear between 0.9 & 1.8 ppm and are said to be shielded
A bicycle tire is filled with air to a pressure of 720 torr at a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius.
Alpha helices are a type of secondary structure in proteins. What is the length of a 25-kDa single-stranded -helical protein segment. Assume a mean residue mass of 110 Da.
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