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Which one of the following is equal to the pKa of a weak acid?

Stumped on Chemistry question. 300 mLs of a 2% NaOH (sodium hydroxide, a base) ...?

Consider a titration involving a weak acid, HA (Ka = 7.89x10-6). A standardized solution NaOH(aq) with a concentration of 0.341M is used as?

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aCO3 + 2HCl --> CaCl2 + CO2 + H2O?

Science or chemistry, unsure ?

Complete the following equation showing the main organic products...?

The reactant concentration in a first-order reaction was 7.10×10−2 M after 30.0 s and 6.00×10−3 M after 60.0 s . ?

dehydration of 1-butanol?

Empirical & Molecular Formula?

Ascorbic acid ( H2C6H6O2 ) has 𝐾a1=8.00×10−5 and 𝐾a2=1.60×10−12 . What's the pH of a 0.281 M ascorbic acid ( H2C6H6O2 ) solution?

10th Grade Chemistry Help?

Please help urgent chemistry homework I need the work ?

Empirical formula question?

What is the maximum mass of chromium, Cr, that can be extracted from 76g of chromium (III) oxide?

How to find the molarity of balanced equation ?

Need help with chemistry problem?

Chemistry help?

Compute for pH of pyridinium chloride.?

Calculate the pH of 1.0M solution of methylamine (𝐶𝐻3𝑁𝐻2 , 𝐾𝑏 = 4.38 × 10−4)?

Measured at 650C and 500 torr, the mass of 3.21 L of a gas is 3.5 g. The molecular weight (molar mass) of the gas is?

What's the pH of a 0.1 M HIO solution knowing that its pKa = 10.4?

Calculate the solubility of magnesium fluoride, MgF2, in water by knowing the Ksp = 5.2 x 10-11?

A certain reaction has an activation energy of 60.0 kJ/mol and a frequency factor ?

chemistry question please answer asap?

Chemistry Help? Balance the following equation representing a reaction that occurs in an acidic solution...?

What is the literature value for heat of solution of benzoic acid?

When 0.280 g of Na(s) reacts with excess F2(g) to form NaF(s), 6.90 kJ of heat is released to surroundings at standard-state conditions.?

What is the intermediate? Please help :)?

mol of nitrogen in 0.40 mol of caffeine.?

What s the molar mass of H2O?

The equilibrium constant, Kc, for the following reaction is 77.5 at 600 K. CO(g) + Cl2(g) COCl2(g)?

At high temperature, 2.00 mol of HBr was placed in a 4.00 L container where it decomposed in the reaction:?

name this compound using IUPAC system?

How much quantity of helium gas in 50 liters container at 27 degree celsius at 140 bar pressure?

what is the polarity of the bond : CO2?

chemistry rate law problem?

The complex Sc(H2O)62+ absorbs light at 520. nm. Calculate ∆ for this complex to three significant figures?

pH problem?

HOW DO YOU DO THIS QUESTION - Urgent Empirical/Molecular Formula Question Chemistry?

Which solution has the higher boiling point, 0.500 M glucose or 0.300 M KCl?

chem hw help please!?

what is the mass of magnesium which completely reacts with 250cm^3 of 1 mol/dm^3 sulfuric acid?

Year 11 Chemistry Help!?

how do you balance these equations? a) Ca3(PO4)2 + SiO2 + C → CaSiO3 + P + CO b) N2H2 + NO2 → N2 + H2O please help!!!!?

If 35.80kg of CaCO3 contain 4.296kg C, 14.33kb Ca, and 17.17kg O, what is the percent composition of CaCO3?

Chemistry help on calculations!?

A phosphorus oxide has an empirical formula of PxOy and 56.36% phosphorus by mass . What is the values of x anf y?

Ethane gas reacts with 670 grams of oxygen gas forming carbon dioxide gas and liquid water. How many grams of water are produced?