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Complexometria
Apresentação da matéria de Química Analítica
IQUI - 31
A complexometria é uma técnica analítica que quantifica íons metálicos em solução por meio de complexos com agentes como o EDTA, sendo essencial para analisar metais em água, alimentos e produtos industriais.
Definição do Termo
Surgida no final do século XIX, é uma técnica sensível e específica, amplamente usada em controle de qualidade e análises clínicas, consolidando-se como essencial na química analítica moderna.
Desenvolvimento ao longo da História
A complexometria se destacou no século XX com o EDTA, descoberto em 1935, que formava complexos estáveis com íons metálicos. Desde então, a técnica evoluiu e se tornou essencial na química moderna.
Ácido etilenodiaminotetracético (EDTA) é o quelante mais usado em química analítica. Praticamente todos os elementos da tabela periódica podem ser analisados com EDTA, seja por titulação direta ou seqüência de reações indiretas. O EDTA é um ácido fraco hexaprótico (H6Y+2) que em soluções aquosas dissocia-se produzindo espécies aniônicas: 
EDTA
Príncipios Fundamentais
EDITAR
Oque são?
A teoria dos complexos explica a ligação de íons metálicos a ligantes, formando estruturas estáveis.
Teoria dos Complexos
A formação de complexos metálicos depende de pH, concentração e competição de íons, afetando sua estabilidade.
Reações de Formação de Complexos
Agentes Complexantes
Agentes complexantes, como o EDTA, ligam-se a íons metálicos formando complexos estáveis. Eles possuem alta especificidade, solubilidade e estabilidade em água. Outros exemplos incluem ácido cítrico, oxálico e aminoácidos.
Agentes complexantes variam em estabilidade e especificidade. EDTA é ótimo para cálcio e magnésio, enquanto o ácido oxálico é melhor para ferro. A escolha depende das propriedades dos íons na amostra.
Comparação entre Diferentes Agentes
Características dos Agentes Complexantes 
Métodos
Métodos Volumétricos e Não Volumétricos
Titrimetria Complexométrica
É um método de análise volumétrica que envolve a adição de um titulante até que o ponto de equivalência seja alcançado. O ponto de equivalência é identificado por uma mudança de cor do indicador metalocrômico.
Métodos volumétricos inclui a titulação direta, onde o titulante é adicionado diretamente à solução contendo o íon metálico. Métodos não volumétricos inclui a espectrofotometria, que mede a absorção de luz pelos complexos metálicos.
Titulação Direta
Íons metálicos são titulados diretamente com EDTA, sendo o ponto final visualizado com um indicador metalocrômico.
Exemplo : Padronização da solução de EDTA com solução padrão de CaCO3
Pequena fração do íon forma complexo com o Ind. 
Titulação com EDTA 
Para que ocorra deslocamento do íon do complexo [Ca-Ind] 
Reação indicativa do Ponto final [
Ca2+(aq) + Indaq) [Ca-Ind]2+ (aq) K f [Ca-Ind]
Experiment: step by step
	Materials
	Objects in class
	Procedure
	Count the objects in class and color each corresponding square
	Time
	30 minutes
1
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Significant contributions to the field
Mercury is the closest planet to the Sun and the smallest one of them all. This planet’s name has nothing to do with the liquid metal
Venus has a beautiful name and is the second planet from the Sun. It’s hot and is the second-brightest natural object in the night sky
Nate Silver
Florence Nightingale
A picture is worth a thousand words
Concepts of Data Variability
Box
Plot
Range
Set
Measure
Tendency
Activity 02: record table
Look at the table and answer
	Day	Mon	Tue	Wed	Thu	Fri	Sat	Sun
	Degrees	21	24	23	21	19	22	23
What was the hottest day?
Write here
What was the least hot day?
What days were hotter than Saturday?
Write here
Write here
What is the purpose of creating a frequency distribution table?
Organize and summarize data
making it easier to identify patterns, trends, and outliers
Activity 03: type of analysis
Find out what type of data collection is involved
D__criptive
Cau__l
Expl___tory
Explains what happened to variables, such as revenue, sales, costs, demographics
Examines the cause and effect relationships between variables to find a correlation
Explore the data and find relationships between variables that were previously unknown
Historical discoveries 
1700s
1700s
1900s
1900s
Bayesian Probability
Venus is the second planet from the Sun
Normal Distribution
Saturn is composed of hydrogen gas
Correlation & Regression
Despite being red, Mars is a cold place
Random Smapling
Neptune is far away from us
Four important concepts
Jupiter is the biggest planet of them all
Trend
Venus is the second planet from the Sun
Insight
Sample
Saturn is composed of hydrogen and helium
Summarizing
Despite being red, Mars is very cold
Game time
Information about something specific
Representation of numerical data
List of numbers or data
Amplitude of variation of a phenomenon
D
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Thanks!
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